2,3-DIAMINOPROPIONIC ACID DERIVATIVE

Abstract: A 2,3-diaminopropionic acid derivative represented by general formula (1) or a pharmaceutically acceptable salt thereof. This compound is useful as a platelet aggregation inhibitor, cancer metastasis inhibitor, wound remedy or bone resorption inhibitor.

Description: The present invention relates to a novel 2,3-diaminopropionic acid derivative being useful as a platelet aggregation inhibitor, a cancer metastasis inhibitor, a wound healing agent or a bone resorption inhibitor. Background Art Proteins, which participate in adhesion between a cell and an interstitial connective tissue and show various biological activities concerning the cell functions of animal cells, are called a cell adhesive protein. For example, there are known fibronectin, vitronectin, laminin, etc. It is known that the core sequence of cell adhesion site of these proteins is arginine-glycine-aspartic acid [Arg-Gly-Asp] (hereinafter, occasionally referred to as RGD) [Pierschbachr, M. D., et al., Nature, 309, 30 (1984), Suzuki, S., et al., J. Biol. Chem., 259 , 15307 (1984), Plow, E., et al., Proc. Natl. Acad. Sci. USA, 82 , 8057 (1985)]. The RGD interacts with a receptor of cell adhesive protein, and as a result, it shows various pharmacological activities. For example, fibrinogen being present in plasma interacts with a platelet membrane glycoprotein complex IIb/IIIa via RGD to cause a platelet aggregation, and it is considered that a synthetic peptide having RGD inhibits the interaction between fibrinogen and a platelet membrane glycoprotein complex llb/llla and hence, it is useful as a platelet aggregation inhibitor [Phillips, D.R., Cell, 65 , 359 (1991)]. Besides, it is also known that a peptide having a RGD derived from snake venom effectively inhibits bone resorption by osteoclast [Sato, M., et al., J. Cell Biol., 111 , 1713 (1990)]. Besides, fibronectin is considered to participate in differentiation and growth of cells [Yamada, K.M., et al., Ann. Rev. Biochem., 52 , 761 (1983)], but since it stimulates migration of fibroblast and macrophage, it is expected to be applied to the treatment of wound or the regulation of immune mechanism. Particularly, fibronectin has been tried to the local treatment of corneal disorder with utilizing the promotion effect thereof on wound healing [Fujikawa, L. S., et al., Lab. Invest., 45 , 120 (1981)]. Moreover, cell adhesive proteins have been drawing attention as a substance participating in cancer metastasis. A cancer cell forms a multicellular mass in the presence of fibronectin or laminin so that it can more easily grow or survive. In fact, it has been confirmed that an RGD sequence, which is an adhesive core of fibronectin, inhibits the metastasis of cancer cell [Humphries, M. J. et al., Science, 233 , 467 (1986)]. Thus, since cell adhesive proteins show various biological activities, a medicament which can selectively interact with a receptor of these proteins can be expected to be useful in the prophylaxis or treatment of various diseases. On the other hand, a lot of screening on non-peptide compounds interacting with a receptor of these proteins have been done as reported, for example, in EP 512831, EP 540334, WO 94/8962, WO 94/12181, EP 445796, etc. However, there is no compound which can clinically be used. Under these circumstances, it has been desired to develop a platelet aggregation inhibitor, a cancer metastasis inhibitor, a wound healing agent or a bone resorption inhibitor, which selectively interacts with a receptor of a cell adhesive protein such as fibrinogen, fibronectin, etc., and shows excellent absorbability and excellent stability in living body. In US-A-4,069,323 N 2 -substituted L-arginine esters and amides are disclosed, which may be used for the inhibition and suppression of thrombosis. EP-A-0 478 363 discloses non-peptide alkylsulfonamide substituted phenyl derivatives for the treatment of diseases caused by thrombus formation. WO 94/12181 pertains to fibrinogen receptor antagonists of the formula X-Y-Z-Aryl-A-B. EP-A-0 512 829 and EP-A-0 512 831 disclose fibrinogen receptor antagonist of the formula: and respectively. Disclosure of Invention The present inventors have intensively studied and have found a novel 2,3-diaminopropionic acid derivative which can selectively interact with a receptor of a cell adhesive protein, such as fibrinogen, fibronectin, etc. That is, the gist of the present invention is as follows. [1] The compound of the formula (5): wherein R 1 is a hydrogen atom, a lower alkyl group, a cycloalkyl group, a lower alkenyl group, a lower alkynyl group, an aryl group, a heterocyclic group, a substituted lower alkyl group, a substituted cycloalkyl group, a substituted lower alkenyl group, a substituted lower alkynyl group, a substituted aryl group or a substituted heterocyclic group; R 2 is a lower alkyl group, a cycloalkyl group, a lower alkenyl group, a lower alkynyl group, an aryl group, a heterocyclic group, a substituted lower alkyl group, a substituted cycloalkyl group, a substituted lower alkenyl group, a substituted lower alkynyl group, a substituted aryl group or a substituted heterocyclic group; X and A 6 are defined by the following (a) or (b), or a pharmaceutically acceptable salt thereof: (a) X is a group of the formula (2): wherein Y 1 is a methine group or a nitrogen atom, V 1 and V 2 are the same or different and each a hydrogen atom or a C 1 -C 6 alkyl group, provided that both V 1 and V 2 are a substituent on the carbon atom, and A 6 is a divalent group selected from the following groups: Y 4 -(CH 2 ) a -CONR 10 -CH 2 -CHR 9 - (R 9 is a hydrogen atom or a C 1 -C 6 alkyl group, R 10 is a hydrogen atom or a C 1 -C 6 alkyl group, a is 1 or 2, Y 4 is a methylene group or an oxygen atom); Y 4 -(CH 2 ) b - (Y 4 is the same as defined above, and b is 5 or 6); (CH 2 ) c -CO-(CH 2 ) d - (c is 2 or 3, d is 3 or 4); (CH 2 ) c -CH(OH)-(CH 2 ) d - (c and d are the same as defined above); CH 2 -NR 10 CO-(CH 2 ) d - (R 10 and d are the same as defined above); Y 4 -(CH 2 ) e -Y 5 - (Y 4 is the same as defined above, Y 5 is an oxygen atom or -NR 11 - (R 11 is a hydrogen atom or a C 1 -C 6 alkyl group), and e is 4 to 6); a group of the formula: wherein a and c are the same as defined above, (b) X is a group of the formula (3): wherein Y 2 and Y 3 are the same or different and each a methine group or a nitrogen atom, V 3 and V 4 are the same or different and each a hydrogen atom, an alkyl group, a substituted C 1 -C 6 alkyl group, a cycloalkyl group, an amino group, an acylamino group, a C 1 -C 6 alkyloxycarbonyl group or a C 1 -C 6 alkyloxycarbonyl group substituted by an aryl group, V 5 is an imino group or an oxygen atom, V 6 and V 7 are a hydrogen atom or a C 1 -C 6 alkyl group, provided that both V 6 and V 7 are a substituent on the carbon atom, or a group of the formula (4): wherein Y 2 , Y 3 and V 3 are the same as defined above, m is 2 or 3, and A 6 is a divalent group selected from the following groups: (CH 2 ) f -CONR 10 -CH 2 -CHR 9 - (R 9 and R 10 are the same as deined above, and f is 0 or 1); Y 4' -(CH 2 ) d - (Y 4' is an oxygen and d is the same as defined above); (CH 2 ) f -CO-(CH 2 ) d - (f and d are the same as defined above); (CH 2 ) f -CH(OH)-(CH 2 ) d - (f and d are the same as defined above); NR 10 CO-(CH 2 ) d - (R 10 and d are the same as defined above); Y 4' -(CH 2 ) g -Y 5 - (Y 4' and Y 5 are the same as defined above, and g is 2 to 4); a group of the formula: wherein a and f are the same as defined above, a group of the formula: wherein f is the same as defined above, Y 6 is a methine group or a nitrogen atom; a group of the formula: wherein Y 5 and f are the same as defined above, and h is 0 or 1; a group of the formula: wherein Y 4 ', Y 5 and h are the same as defined above. [2] The compound according to [1], where X and A 6 are defined by the following (a) or (b), or a pharmaceutically acceptable salt thereof. (a) X is a group of the formula (2): wherein Y 1 , V 1 and V 2 are the same as defined above, and A 6 is a divalent group selected from the following groups: Y 4 -(CH 2 ) a -CONR 10 -CH 2 -CHR 9 - (R 9 , R 10 , a and Y 4 are the same as defined above); CH 2 -NR 10 CO-(CH 2 ) d - (R 10 and d are the same as defined above) a group of the formula: wherein a and c are the same as defined above. (b) X is a group of the formula (3): wherein Y 2 , Y 3 , V 3 , V 4 , V 5 , V 6 and V 7 are the same as defined above, or a group of the formula (4): wherein Y 2 , Y 3 , V 3 and m are the same as defined above, A 6 is a divalent group selected from the following groups: (CH 2 ) f -CONR 10 -CH 2 -CHR 9 - (R 9 , R 10 and f are the same as defined above); Y 4' -(CH 2 ) d - (Y 4' and d are the same as defined above); (CH 2 ) f -CO-(CH 2 ) d - (f and d are the same as defined above); a group of the formula: wherein a and f are the same as defined above; a group of the formula: wherein f and Y 6 are the same as defined above. [3] The compound according to any one of [1] or [2], wherein X is a group of the formula (6): wherein Y 2 , Y 3 , V 3 , V 4 , V 6 and V 7 are the same as defined above, or a pharmaceutically acceptable salt thereof. [4] The compound according to [3], wherein Y 2 and Y 3 are a methine group, and V 6 and V 7 are a hydrogen atom, or a pharmaceutically acceptable salt thereof. [5] The compound according to [1], wherein X is a 4-amidinophenyl group, and A 6 is -CO-NH-CH 2 -CH 2 - or -C-(CH 2 ) 3 -, or a pharmaceutically acceptable salt thereof. [6] The compound according to any one of [1] to [5], wherein the stereo-configuration of the 2-position thereof is S-configuration, or a pharmaceutically acceptable salt thereof. [7] A platelet aggregation inhibitor which contains the compound as set forth in any one of [1] ] to [6], or a pharmaceutically acceptable salt thereof. [8] A cancer metastasis inhibitor which contains the compound as set forth in any one of [1] ] to [6], or a pharmaceutically acceptable salt thereof. [9] A wound healing agent which contains the compound as set forth in any one of [1] ] to [6], or a pharmaceutically acceptable salt thereof. [10] A bone resorption inhibitor which contains the compound as set forth in any one of [1] to [6], or a pharmaceutically acceptable salt thereof. The lower alkyl group includes a straight chain or branched chain alkyl group having 1 to 6 carbon atoms, for example, methyl, ethyl, propyl, 1-methylethyl, butyl, 1-methylpropyl, 2-methylpropyl, 1,1-dimethylethyl, pentyl, 1-methylbutyl, 1-ethylpropyl, hexyl, 1-methylpentyl, 1-ethylbutyl, 2-methylpentyl, etc. The alkyl group includes a straight chain or branched chain alkyl group having 1 to 16 carbon atoms, for example, methyl, ethyl, propyl, 1-methylethyl, butyl, 1-methylpropyl, 2-methylpropyl, 1,1-dimethylethyl, pentyl, 1-methylbutyl, 1-ethylpropyl, hexyl, 1-methylpentyl, 1-ethylbutyl, 2-methylpentyl, octyl, decyl, 3-methylnonyl, 2,5-diethylheptyl, dodecyl, tetradecyl, pentadecyl, hexadecyl, etc. The lower alkenyl group includes a straight chain or branched chain alkenyl group having 2 to 6 carbon atoms, and having 1 to 3 double bonds, for example, vinyl, 1-propenyl, 2-propenyl, 1-methylvinyl, 1-butenyl, 2-butenyl, 1-pentenyl, 1-hexenyl, etc. The lower alkynyl group includes a straight chain or branched chain alkynyl group having 2 to 6 carbon atoms, and having 1 to 3 triple bonds, for example, ethynyl, 1-propynyl, 2-propynyl, 1-butynyl, 1-pentynyl, 1-hexynyl, etc. The cycloalkyl group includes a cycloalkyl group having 5 to 7 carbon atoms, for example, cyclopentyl, cyclohexyl, cyclopentyl, etc. The aryl group includes an aryl group having 6 to 14 carbon atoms, for example, phenyl, 1-naphthyl, 2-naphthyl, 1-anthranyl, 2-anthranyl, 9-fluorenyl, etc. The heterocyclic group includes a saturated or unsaturated heterocyclic group selected from a 5 to 7-membered monocyclic group, a 9- to 10- membered bicyclic group, and a 12- to 14-membered tricyclic group, said heterocyclic group contains 1 to 4 heteroatoms selected from oxygen atom, nitrogen atom, sulfur atom, and the nitrogen atom or sulfur atom thereof may optionally be oxidized, and the binding position thereof is at a nitrogen atom or a carbon atom. Besides, the carbon atom forming the ring may be optionally substituted by an oxo group. Suitable examples thereof are a 6-membered saturated monocyclic heterocyclic group having 1 or 2 heteroatoms selected from oxygen atom, nitrogen atom and sulfur atom, such as piperidyl, piperazinyl, morpholinyl, a 6-membered unsaturated monocyclic heterocyclic group having 1 or 2 heteroatoms selected from oxygen atom, nitrogen atom and sulfur atom, such as pyridyl, pyridazinyl, pyrazinyl, etc., a 5-membered saturated monocyclic heterocyclic group containing 1 to 2 heteroatoms selected from oxygen atom, nitrogen atom and sulfur atom, such as oxolanyl, pyrrolidinyl, etc., a 5-membered unsaturated monocyclic heterocyclic group having 1 to 3 heteroatoms selected from oxygen atom, nitrogen atom and sulfur atom, for example, imidazolyl, furyl, 2-oxo-1,3-dioxolenyl, pyrrolyl, 5-oxo-2-tetrahydrofuranyl, etc., a 9- to 10-membered unsaturated bicyclic heterocyclic group having 1 to 3 heteroatoms selected from oxygen atom, nitrogen atom and sulfur atom, such as quinolyl, isoquinolyl, indolyl, 1,3-dihydro-3-oxo-1-isobenzofuranyl, etc., a 12- to 14-membered unsaturated tricyclic heterocyclic group having 1 to 3 heteroatoms selected from oxygen atom, nitrogen atom and sulfur atom, such as anthraquinolyl, etc. The aromatic heterocyclic group includes a heterocyclic group which is an aromatic group. The substituted lower alkyl group includes a lower alkyl group substituted by 1 to 5 groups selected from the group consisting of a cycloalkyl group, a substituted cycloalkyl group, an aryl group, a substituted aryl group, a heterocyclic group, a substituted heterocyclic group, a halogen atom, -OP 1 (P 1 is a hydrogen atom, a lower alkyl group, a cycloalkyl group, an aryl group, or a modifying group for hydroxy group), -OCOP 2 (P 2 is a hydrogen atom, a lower alkyl group, a cycloalkyl group, an aryl group or a heterocyclic group), -NP 3 P 4 (P 3 is a hydrogen atom or a lower alkyl group, P 4 is a hydrogen atom, a lower alkyl group, a cycloalkyl group, an aryl group, a heterocyclic group or a modifying group for amino group), -C(=NP 5 )NP 6 P 7 (P 5 , P 6 and P 7 are the same or different, and each a hydrogen atom, a lower alkyl group, a cycloalkyl group, a modifying group for amidino group), -NHC(=NP 5 )NP 6 P 7 (P 5 , P 6 and P 7 are the same as defined above), a nitro group, a cyano group, -COOP 8 (P 8 is a hydrogen atom, a lower alkyl group, a cycloalkyl group, an aryl group, a heterocyclic group or a modifying group for carboxyl group), -CONP 9 P 10 (P 9 is a hydrogen atom or a lower alkyl group, P 10 is a hydrogen atom, a lower alkyl group or a modifying group for amido group), -SP 11 (P 11 is a hydrogen atom, a lower alkyl group, a cycloalkyl group, an aryl group, a heterocyclic group or a modifying group for thiol group), -COP 12 (P 12 is a hydrogen atom, a lower alkyl group, a cycloalkyl group, an aryl group or a heterocyclic group), -NHCOP 13 (P 13 is a hydrogen atom, a lower alkyl group, a cycloalkyl group or an aryl group), -S(O) i P 14 (P 14 is a lower alkyl group, a cycloalkyl group or an aryl group, and i is 1 or 2), -SO 2 NP 15 P 16 (P 15 and P 16 are the same or different and each a hydrogen atom, a lower alkyl group, a cycloalkyl group or an aryl group) and -OCOOP 17 (P 17 is a lower alkyl group, a cycloalkyl group, an aryl group or a heterocyclic group). Suitable examples are benzyl, 2-phenylethyl, 3-phenylpropyl, 4-phenylbutyl, 5-phenylpentyl, 6-phenylhexyl, indolylmethyl, 2-(3-indolyl)ethyl, bromomethyl, pivaloyloxymethyl, 1-ethoxycarbonyloxyethyl, 5-methyl-2-oxo-1,3-dioxolen-4-ylmethyl, 2-chloroethyl, 2-dimethylaminoethyl, diethylaminoethyl, 3-dimethylamino-2-(dimethylaminomethyl)propyl, 2-(1-morpholinyl)ethyl, 1-acetoxyethyl, 1-methoxycarbonyloxyethyl, acetoxymethyl, 1-acetoxy-1-acetoxy-1-phenylmethyl, methoxycarbonylmethyl, 1-pivaloyloxyethyl, etc. The substituted lower alkenyl group includes a lower alkenyl group substituted by 1 to 5 groups selected from the group consisting of a cycloalkyl group, an aryl group, a heterocyclic group, a halogen atom, -OP 18 (P 18 is a hydrogen atom, a lower alkyl group or a modifying group for hydroxy group), -OCOP 19 (P 19 is a hydrogen atom or a lower alkyl group), a nitro group, a cyano group, -COOP 20 (P 19 is a hydrogen atom or a modifying group for carboxyl group), -CONP 9 P 10 (P 9 and P 10 are the same as defined above), -COP 21 (P 21 is a hydrogen atom or a lower alkyl group) and -OCOOP 22 (P 22 is a lower alkyl group). Suitable examples are 3-phenyl-2-propenyl, 5-methoxy-2-pentenyl, 2-carboxylvinyl, etc. The substituted lower alkynyl group includes a lower alkynyl group substituted by 1 to 5 groups selected from the group consisting of a cycloalkyl group, an aryl group, a heterocyclic group, a halogen atom, -OP 18 (P 18 is the same as defined above), -OCOP 19 (P 19 is the same as defined above), a nitro group, a cyano group, -COOP 20 (P 20 is the same as defined above), -CONP 9 P 10 (P 9 and P 10 are the same as defined above), -COP 21 (P 21 is the same as defined above) and -OCOOP 22 (P 22 is the same as defined above). Suitable example is 3-phenyl-2-propynyl group. The substituted cycloalkyl group includes a cycloalkyl group substituted by 1 to 3 groups selected from the group consisting of a lower alkyl group, an aryl group, a heterocyclic group, a halogen atom, -OP 18 (P 18 is the same as defined above), -OCOP 19 (P 19 is the same as defined above), -NP 23 P 24 (P 23 is a hydrogen atom or a lower alkyl group, P 24 is a hydrogen atom, a lower alkyl group or a modifying group for amino group), -C(=NP 25 )NP 26 P 27 (P 25 , P 26 and P 27 are the same or different and each a hydrogen atom or a modifying group for amidino group), -NHC(=NP 25 )NP 26 P 27 (P 25 , P 26 and P 27 are the same as defined above), a nitro group, a cyano group, -COOP 20 (P 20 is the same as defined above), -CONP 9 P 10 (P 9 and P 10 the same as defined above), -SP 28 (P 28 is a hydrogen atom, a lower alkyl group or a modifying group for thiol group), -COP 21 (P 21 is the same as defined above), -NHCOP 29 (P 29 is a hydrogen atom or a lower alkyl group), -S(O) i P 30 (P 30 is a lower alkyl group, and i is the same as defined above), -SO 2 NP 31 P 32 (P 31 and P 32 are the same or different and each a hydrogen atom or a lower alkyl group) and -OCOOP 22 (P 22 is the same as defined above). Suitable examples are 4-chlorocyclohexyl, 4-cyanocyclohexyl, 2-dimethylaminocyclohexyl, 4-methoxycyclohexyl, etc. The substituted heterocyclic group includes a heterocyclic group substituted by 1 to 3 groups selected from the group consisting of a lower alkyl group, a cycloalkyl group, an aryl group, a heterocyclic group, a halogen atom, -OP 18 (P 18 is the same as defined above), -OCOP 19 (P 19 is the same as defined above), -NP 23 P 24 (P 23 and P 24 are the same as defined above), -C(=NP 25 )NP 26 P 27 (P 25 , P 26 and P 27 are the same as defined above), -NHC(=NP 25 )NP 26 P 27 (P 25 , P 26 and P 27 are the same as defined above), a nitro group, a cyano group, -OCOOP 22 (P 22 is the same as defined above), -CONP 9 P 10 (P 9 and P 10 are the same as defined above), -SP 28 (P 28 is the same as defined above), -COP 21 (P 21 is the same as defined above), -NHCOP 29 (P 29 is the same as defined above), -S(O) i P 30 (P 30 and i are the same as defined above), -SO 2 NP 31 P 32 (P 31 and P 32 are the same as defined above) and -OCOOP 22 (P 22 is the same as defined above). Suitable examples are 1-acetyl-4-piperidinyl, 1-benzyl-4-imidazolyl, 1-methyl-3-indolyl, 5-methyl-2-oxo-1,3-dioxolen-4-yl, etc. The substituted aryl group includes an aryl group substituted by 1 to 5 groups selected from the group consisting of a lower alkyl group, a lower alkenyl group, a lower alkynyl group, a cycloalkyl group, an aryl group, a heterocyclic group, a substituted alkenyl group, a substituted alkynyl group, a substituted cycloalkyl group, a substituted heterocyclic group, a halogen atom, -OP 1 (P 1 is the same as defined above), -OCOP 2 (P 2 is the same as defined above), -NP 3 P 4 (P 3 and P 4 are the same as defined above), -C(=NP 5 )NP 6 P 7 (P 5 , P 6 and P 7 are the same as defined above), -NHC(=NP 5 )NP 6 P 7 (P 5 , P 6 and P 7 are the same as defined above), a nitro group, a cyano group, -COOP 8 (P 8 is the same as defined above), -CONP 9 P 10 (P 9 and P 10 are the same as defined above), -SP 11 (P 11 is the same as defined above), -COP 12 (P 12 is the same as defined above), -NHCOP 13 (P 13 is the same as defined above), -S(O) i P 14 (i and P 14 are the same as defined above), -SO 2 NP 15 P 16 (P 15 and P 16 are the same as defined above), -OCOOP 17 (P 17 is the same as defined above), a lower alkyl group substituted by -OP 1 (P 1 is the same as defined above) or -NP 3 P 4 (P 3 and P 4 are the same as defined above), and a lower alkyl group substituted by 1 to 5 atoms selected from the group consisting of fluorine atom, chlorine atom and bromine atom. When two substituents of the substituted aryl group are located adjacently, these substituents may optionally combine together to form a 4- to 7-membered ring. Suitable examples of the substituted aryl group are 4-fluorophenyl, 3-chlorophenyl, 4-chlorophenyl, 3-bromophenyl, 4-bromophenyl, 4-iodophenyl, 2,4-dichlorophenyl, 4-hydroxyphenyl, 3,4-dihydroxyphenyl, 4-methylphenyl, 4-methoxyphenyl, 3,4-dimethoxyphenyl, 3,4-methylenedioxyphenyl, 4-aminophenyl, 4-guanidinophenyl, 4-aminomethylphenyl, 4-cyanophenyl, 4-carboxyphenyl, 4-acetylphenyl, 4-chloro-1-naphthyl, 4-amidinophenyl, 4-nitrophenyl, 4-ethoxycarbonylphenyl, 4-acetoxyphenyl, 4-benzyloxyphenyl, 2-fluoro-4-hydroxyphenyl, 5-indanyl, 4-(2-carboxyvinyl)phenyl, 4-(2-butyl)phenyl, 3,5-dichloro-2-hydroxyphenyl, 2,3,4-trichlorophenyl, 2,4,5-trichlorophenyl, 2,4,6-tri-(2-propyl)phenyl, 2,5-dimethylphenyl, 2-nitrophenyl, 3-nitrophenyl, 2,4-dinitrophenyl, 4-chloro-3-nitrophenyl, 2,5-dimethoxyphenyl, 2,5-dimethylphenyl, 2-methoxycarbonylphenyl, 3-carboxyphenyl, 2-methoxy-5-carboxyphenyl, 4-t-butylphenyl, 4-ethylphenyl, 2-methylphenyl, 3-methylphenyl, 2,4,6-trimethylphenyl, 5-dimethylamino-1-naphthyl, 4-acetaminophenyl, 2,3,4,5,6-pentafluorophenyl, 2,3,4,5,6-pentamethylphenyl, 4-dimethylamino-3-nitrophenyl, 2,3,5,6-tetramethylphenyl, 2,5-dichlorophenyl, 4-trifluoromethylphenyl, 2-trifluoromethylphenyl, 3-trifluoromethylphenyl, 3,5-ditrifluoromethylphenyl, etc. The acyl group includes a straight chain or branched chain alkanoyl group having 1 to 6 carbon atoms, a cycloalkylcarbonyl group having 6 to 8 carbon atoms, a benzoyl group, a lower alkylsulfonyl group, an arylsulfonyl group, etc., and suitable examples are an alkanoyl group such as acetyl, propionyl, butyryl, isobutyryl, valeryl, isovaleryl, pivaloyl, hexanoyl, t-butylacetyl, etc., a cycloalkylcarbonyl group such as cyclopentylcarbonyl, cyclohexylcarbonyl, cycloheptylcarbonyl, etc., a lower alkylsulfonyl group such as methylsulfonyl, ethylsulfonyl, propylsulfonyl, butylsulfonyl, etc., and an arylsulfonyl group such as benzenesulfonyl, naphthalenesulfonyl, etc. The halogen atom is fluorine atom, chlorine atom, bromine atom, iodine atom, etc. When the compound of the formula (5) contains an asymmetric carbon atom, the present invention also includes any isomer or a mixture thereof. When the compound of the formula (5) contains two or more asymmetric carbon atoms, the present compounds exist in the form of an enantiomer, diastereomer, or a mixture thereof, for example, in the form of a racemic mixture thereof. The stereo-configuration of the asymmetric 2-carbon atom of 2,3-diaminopropionic acid is preferably S-configuration. Suitable examples for R 1 of the formula (5) are a hydrogen atom, a lower alkyl group such as methyl, ethyl, propyl, etc., cyclohexyl, benzyl, a lower alkyl group substituted by -OCOP 33 (P 33 is a lower alkyl group, a cycloalkyl group, an aryl group, or a heterocyclic group) such as acetoxymethyl, 1-acetoxyethyl, 1-acetoxy-1-phenylmethyl, pivaloyloxymethyl, 1-pivaloyloxyethyl, etc., a lower alkyl group substituted by -OCOOP 34 (P 34 is a lower alkyl group, a cycloalkyl group, an aryl group or a heterocyclic group) such as 1-methoxycarbonyloxyethyl, 1-ethoxycarbonyloxyethyl, etc., a lower alkyl group substituted by a substituted heterocyclic group such as 5-methyl-2-oxo-1,3-dioxolen-4-ylmethyl, 2-(1-morpholinyl)ethyl, etc., a heterocyclic group such as 5-oxo-2-tetrahydrofuranyl, 1,3-dihydro-3-oxo-1-isobenzofuranyl, a substituted aryl group such as 5-indanyl, etc., 3-dimethylamino-2-(dimethylaminomethyl)propyl, 2-dimethylaminoethyl, 2-diethylaminoethyl, methoxycarbonylmethyl, 2-dimethylaminocyclohexyl, etc. Suitable examples for R 2 in the formula (5) are a lower alkyl group, a substituted lower alkyl group, a cycloalkyl group, a substituted cycloalkyl group, an aryl group, a substituted aryl group, a heterocyclic group, a substituted heterocyclic group, etc., preferably an aryl group, a substituted aryl group, an aromatic heterocyclic group, a substituted aromatic heterocyclic group, etc., for example, a lower alkyl group such as methyl, ethyl, propyl, butyl, etc., a substituted lower alkyl group such as 2-chloroethyl, benzyl, etc., a cycloalkyl group such as cyclohexyl, etc., an aryl group such as phenyl, 1-naphthyl, 2-naphthyl, 1-anthranyl, etc., a substituted aryl group such as 8-quinolyl, 1-anthraquinolyl, 4-(2-carboxylvinyl)phenyl, 4-(2-butyl)phenyl, 3,5-dichloro-2-hydroxyphenyl, 2,3,4-trichlorophenyl, 2,4,5-trichlorophenyl, 2,4,6-tri-(2-propyl)phenyl, 2,5-dimethylphenyl, 2-nitrophenyl, 3-nitrophenyl, 2,4-dinitrophenyl, 4-chloro-3-nitrophenyl, 2,5-dimethoxyphenyl, 2,5-dimethylphenyl, 2-methoxycarbonylphenyl, 3-carboxyphenyl, 2-methoxy-5-carboxyphenyl, 4-t-butylphenyl, 4-ethylphenyl, 2-methylphenyl, 3-methylphenyl, 2,4,6-trimethylphenyl, 5-dimethylamino-1-naphthyl, 4-acetaminophenyl, 2,3,4,5,6-pentafluorophenyl, 2,3,4,5,6-pentamethylphenyl, 3-nitro-4-dimethylaminophenyl, 2,3,5,6-tetramethylphenyl, 4-nitrophenyl, 4-bromophenyl, 4-iodophenyl, 4-chlorophenyl, 4-fluorophenyl, 4-carboxyphenyl, 4-methylphenyl, 4-methoxyphenyl, 4-trifluoromethylphenyl, 3-trifluoromethylphenyl, 2-trifluoromethylphenyl, 2,5-dichlorophenyl, 3,5-ditrifluoromethylphenyl, etc., a non-aromatic heterocyclic group such as 3-morphonyl, 2-piperidyl, etc., a substituted non-aromatic heterocyclic group such as 3-(2-methyl)morphonyl, 2-(5-methyl)piperidyl, etc., an aromatic heterocyclic group such as 2-thienyl, 3-pyridyl, 8-quinolyl, etc., a substituted aromatic heterocyclic group such as 2-(5-chloro)thienyl, 2-(5-bromo)thienyl, 2-(5-(2-pyridyl)thienyl), 3-(5-methyl)pyridyl, 2-(5-dichloromethyl)furyl, 3-(2-methoxycarbonyl)thienyl, 3-(2,5-dichloro)thienyl, 4-(3,5-dimethyl)isoxazolyl, 5-(2,4-dimethyl)thiazolyl, 4-(1-methyl)imidazolyl, etc. The modifying groups for hydroxy group, thiol group, carboxyl group, amido group, amino group and amidino group are protecting groups for the side chain of amino acid disclosed in Izumiya, et al., Fundamental Study and Experiments of Peptide Synthesis (published by MARUZENE, 1985), or Greene, et al. Protective Groups in Organic Synthesis, (published by John Wiley & Sons, 1991). The modifying groups for hydroxyl group include an ether-type modifying group or an acyl-type modifying group. The ether-type modifying groups are, for example, benzyl, 2-nitrobenzyl, 2,6-dichlorobenzyl, t-butyl, etc. The acyl-type modifying groups are, for example, a lower alkanoyl group, which is a straight chain or branched chain alkanoyl group having up to 5 carbon atoms, such as acetyl, propanoyl, butanolyl, etc. The modifying groups for thiol group include a sulfide-type modifying group, etc., for example, benzyl, 4-methylbenzyl, 4-nitrobenzyl, 4-methoxybenzyl, acetamidomethyl, etc. The modifying group for carboxyl group includes an ester-type modifying group, such as a lower alkyl group, 2,2,2-trichloroethyl, benzyl, 4-methoxybenzyl, diphenylethyl, etc. The modifying group for amido group includes, for example, 2,4-dimethoxybenzyl, etc. The modifying group for amino group includes an urethane-type modifying group or an acyl-type modifying group. The urethane-type modifying groups are, for example, benzyloxycarbonyl, 4-nitrobenzyloxycarbonyl, 4-methoxybenzyloxycarbonyl, 2-methanesulfonylethoxycarbonyl, 2,2,2-trichloroethoxycarbonyl, t-butyloxycarbonyl, 9-fluorenylmethoxycarbonyl, etc. The acyl-type modifying groups are, for example, formyl, acetyl, benzoyl, trifluoroacetyl, etc. The modifying group for amidino group or guanidino group includes an urethane-type modifying group such as benzyloxycarbonyl, t-butyloxycarbonyl, etc., 4-toluenesulfonyl, 4-methoxybenzenesulfonyl, nitro, etc. In case of urethane-type modifying group, one or two urethane-type modifying groups may be introduced, and in case of other modifying groups, only one modifying group is introduced. The present compound of the formula (5) can be prepared by a conventional method from easily obtainable starting materials and reagents, for example, by a method disclosed below or a modified method thereof. The processes for preparing the present compound (5) are explained in the following (a) to (b). (a) The process for preparing the compound (5): The compound (5) is prepared by the following scheme. wherein R 1 , R 2 , A 6 and X are the same as defined above, R 12 and R 13 are the same as R 1 and R 2 which are, if necessary, protected by a protecting group, respectively, and X 1 is the same as X (X is the same as defined above) which is, if necessary, protected by a protecting group. That is, the above process is carried out by condensing the compound (12) and the compound (21) by amido-bond producing reaction, followed by removing the protecting groups, if necessary. The amido-bond producing reaction is carried out by a conventional method, for example, by a method disclosed in Izumiya, et al., Fundamental Study and Experiments of Peptide Synthesis (published by MARUZENE, 1985). For example, a compound having a free amino group and a compound having a free carboxyl group are reacted with stirring in the presence of a condensing agent such as 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride, etc., in an inert solvent such as N,N-dimethylformamide, dichloromethane, acetonitrile, etc., at a temperature of from 0°C to 40°C for 1 to 24 hours. If necessary, the reaction is carried out in the presence of an additive such as 1-hydroxybenzotriazole, etc., or in the presence of a base such as triethylamine, etc. The compound (12) is prepared by a conventional method from easily obtainable starting materials. That is, the compound (12) is prepared by using a carboxylic acid compound, a ketone compound, an aldehyde compound or a halide compound, which is represented by a compound of the formula (14): wherein V 1 and V 2 are the same as defined above, X 2 is a protecting group for amino group, a compound of the formula (15): wherein V 1 , V 2 and X 2 are the same as defined above, a compound of the formula (16): wherein V 5 , V 6 , V 7 , Y 2 and Y 3 are the same as defined above, V 8 and V 9 are the same or different and each a hydrogen atom, an alkyl group, a substituted lower alkyl group, a cycloalkyl group, an amino group, an acylamino group, a lower alkyloxycarbonyl group, a lower alkyloxycarbonyl group substituted by an aryl group, or a protecting group for amidino group, a group of the formula (17): wherein V 6 , V 7 , Y 2 and Y 3 are the same as defined above, Q 3 is a carboxyl group, formyl group or X 3 (X 3 is bromine atom, iodine atom or chlorine atom), or a group of the formula (18): wherein m, Q 3 , Y 2 and Y 3 are the same as defined above, by carbon atom-increasing reaction such as Horner-Emmons Reaction, Wittig Reaction, Grignard Reaction, Coupling Reaction using palladium, etc., catalytic hydrogenation reaction in the presence of a suitable catalyst, reduction using boron hydride compounds such as sodium borohydride, etc., aluminum hydride compounds such as lithium aluminum hydride, etc., oxidization reaction such as Collins oxidization, PCC oxidization, Swern oxidization, or by a combination of these reactions. In this reaction, the protection procedure or the removal of protecting group is also applied when necessary. When the compound (17) is used as a starting compound, the cyano group thereof is converted into an amidino group or into an amido group at a suitable step by a conversion method disclosed in J. Med. Chem. 35 , 4393 (1992), Pharmazie, 33 , 39 (1978) or Org. Synth., II , 44 (1943), etc., which is illustrated below. wherein V 3 , V 4 , V 5 , V 6 , V 7 , V 8 , V 9 , Y 2 , Y 3 and A 6 are the same as defined above, X 4 is a protecting group for carboxyl group. The compound (19) is treated with hydrogen sulfide and methyl iodide, followed by reacting the product with ammonium acetate or an amine compound to be converted into an amidino compound. The amidino group thereof is protected, and then the protecting group for carboxyl group is removed. Alternatively, the compound (19) is treated with aqueous hydrogen peroxide solution in the presence of potassium carbonate, and if necessary, introducing thereto groups of V 8 and V 9 , and followed by removing the protecting group for carboxyl group to give an amido compound. When the compound (18) is used as a starting compound, the compound (20') is prepared by converting the compound (20) into an amido compound, followed by converting the product into an amidino compound, as illustrated below. wherein m, X 4 , Y 2 , Y 3 and A 6 are the same as defined above. The processes for preparing the compound (45), the compound (51) and the compound (54), which are included in the copound (12) are exemplified below. The compound (45) is prepared by the following scheme. wherein f, X 1 , X 3 and X 4 are the same as defined above, R 19 and R 20 are independently a hydrogen tom or a lower alkyl group. The compound (45) is prepared by stirring the compound (46) and the compound (47) in an inert solvent such as N,N-dimethylformamide, dichloromethane, ethyl acetate, etc., in the presence of a base such as sodium hydrogen carbonate, triethylamine, potassium carbonate, etc. The compound of the formula (46) is prepared by the following scheme. wherein f, R 19 , R 20 , X 1 , X 2 and X 3 are the same as defined above. The compound (46) is prepared from the compound (48) and the compound (49) in the same manner as in the preparation of the compound (45). The compound (48) and the compound (49) are prepared by the above methods. The compound (51) is prepared by the following scheme. wherein f, X 1 , R 19 , R 20 , X 3 and X 4 are the same as defined above. The compound (51) is prepared from the compound (48) and the compound (52) by the same manner as in the preparation of the compound (46). The compound (52) is prepared by the same manner as in the preparation of the compound (12). The compound (54) is prepared by the following scheme. wherein V 5 , V 6 , V 7 , V 8 , V 9 and h are the same as defined above. 4-Bromobenzophenone derivative is treated by the method disclosed in Japanese Patent First Publication (Kokai) No. 41852/1979, allowed by a reaction according to the method of the preparation of the compound (12) to give the compound (54). The compound 12) is prepared, for example, by a method of 10 introducing a protecting group into a commercially available compound, a method disclosed in J. Med. Chem., 35 , 4393 (1992), J. Med. Chem., 36 , 1811 (1993) or Japanese Patent First Publication (Kokai) No. 288051/1992, or by methods disclosed in Examples. The compound (21) is prepared by a method disclosed in Synthesis, 1981 , 266, from commercially available asparagine derivatives. Besides, the compound (21) is also prepared from commercially available 2,3-diaminopropionic acid and a derivative thereof, as illustrated below. wherein R 12 , R 13 and X 2 are the same as defined above, and X 5 is a protecting group for amino group. The 3-amino group of the compound (22) is protected, and R 12 is introduced into the carboxyl group thereof, and the protecting group for the 2-amino group is removed, and then R 13 SO 2 is introduced thereto, and further the protecting group for the 3-amino group is removed to give the compound (21). The process for introduction of R 13 SO 2 is carried out by treating a free amino group with a halide compound of a corresponding sulfonic acid, a halide compound or an anhydride compound of a corresponding carboxylic acid or monoester compound of carboxylic acid. For example, a halide compound or an anhydride compound is stirred in an inert solvent such as N,N-dimethylformamide, dichloromethane, ethyl acetate, 1,4-dioxane, or in a mixture of these solvents, at a temperature of from 0°C to 80°C for 1 to 24 hours. If necessary, a base such as triethylamine, pyridine, sodium hydrogen carbonate, etc. may be added thereto. (b) The process for preparing the compound (5) wherein A 6 is -Y 4 -(CH 2 ) a - CONR 10 -CH 2 CHR 9 -, -(CH 2 ) f -CONR 10 -CH 2 CHR 9 -, (i.e. the compound of the formula (23)): The compound (23) is prepared by the following scheme, wherein R 1 , R 2 , X, X 1 , R 12 , and R 13 are the same as defined above, A 0 is -Y 4 -(CH 2 ) a -, -(CH 2 ) c - or -(CH 2 ) f -, A 6' is -Y 4 -(CH 2 ) a -CONR 10 -CH 2 CHR 9 -, -(CH 2 ) f -CONR 10 -CH 2 CHR 9 -, Z is -NR 10 -CH 2 CHR 9 - or R 9 , R 10 , Y, a, c and f are the same as defined above) which is, if necessary, protected by a protecting group. The above process is carried out by condensing the compound (24) and the compound (25) by amido-bond producing reaction, and if necessary, followed by removing the protective group. The compound (24) is prepared, for example, by the process for preparing the compound (12) in the above process (a). The compound (25) is prepared by the following scheme. wherein X 2 , R 12 , R 13 and Z are the same as defined above. The above process is carried out by condensing the compound (26) and the compound (21) by amido-bond producing reaction, and if necessary, followed by removing X 2 , which is a protecting group for amino group. The compound (26) is prepared by a conventional method, for example, by introducing a protecting group into the amino group of the aminocarboxylic acid in general. The above processes (a) and (b) are merely exemplified, but the present compound may be prepared with changing the order of the reactions of these processes, or other processes. Besides, the compounds of the formula (5) other than the above can also be prepared by the similar method to the above processes (a) and (b). The protecting groups for hydroxy group, for thiol group, for carboxyl group, for amido group, for amino group, for guanidino group, for imidazolyl group, for indolyl group and for amidino group are, for example, protecting groups for the side chain of amino acid disclosed in Izumiya et al., Fundamental Study and Experiments of Peptide Synthesis (Maruzene, 1985), or Greene, Protective Groups in Organic Synthesis (John Wiley & Sons, 1991). The protecting group for hydroxy group may be an ether-type protecting group or an acyl-type protecting group. The ether-type protecting group is, for example, benzyl, 2-nitrobenzyl, 2,6-dichlorobenzyl, t-butyl, etc. The acyl-type protecting group is, for example, a lower alkanoyl group, etc. The lower alkanoyl group is, for example, a straight chain or branched chain alkanoyl group having up to 5 carbon atoms, such as acetyl, propanoyl, butanoyl, etc. The protecting group for thiol group may be a sulfide-type protecting group, etc. for example, benzyl, 4-methylbenzyl, 4-nitrobenzyl, 4-methoxybenzyl, acetamidomethyl, etc. The protecting group for carboxyl group may be an ester-type protecting group, for example, a lower alkyl group, 2,2,2-trichloroethyl, benzyl, 4-methoxybenzyl, diphenylethyl, etc. The protecting group for amido group may be 2,4-dimethoxybenzyl, etc. The protecting group for amino group may be an urethane-type protecting group or an acyl-type protecting group, etc. The urethane-type protecting group may be, for example, benzyloxycarbonyl, 4-nitrobenzyloxycarbonyl, 4-methoxybenzyloxycarbonyl, 2-methanesulfonylethoxycarbonyl, 2,2,2-trichloroethoxycarbonyl, t-butyloxycarbonyl, 9-fluorenylmethoxycarbonyl, etc. The acyl-type protecting group may be, for example, formyl, acetyl, benzoyl, trifluoroacetyl, etc. The protecting group for guanidino group may be, for example, an urethane-type protecting group such as benzyloxycarbonyl, t-butyloxycarbonyl, etc., 4-toluenesulfonyl, 4-methoxybenzenesulfonyl, nitro, etc. In case of urethane-type protecting group, one or two urethane-type protecting groups may be introduced, and in case of other protecting groups, only one protecting group is introduced. The protecting group for imidazolyl group may be, for example, 4-toluenesulfonyl group, benzyloxycarbonyl group, benzyl group, etc. The protecting group for indolyl group may be formyl group, benzyloxycarbonyl group, etc. The protecting group for amidino group may be an urethane-type protecting group such as t-butoxycarbonyl, benzyloxycarbonyl, etc. The method for introduction of each modifying group and each protecting group and the removal of the protecting group are disclosed in Greene, et al., Protective Groups in Organic Synthesis (John Wiley & Sons, 1991), or Izumiya et al., Fundamental Study and Experiments of Peptide Synthesis (Maruzene, 1985). The method for introduction of a modifying group or protecting group for amino group and the method for the removal of the protecting group are explained below. t-Butoxycarbonyl group is introduced into a free amino group by stirring with di-t-butyldicarbonate in an inert solvent such as 1,4-dioxane/water at 0 to 40°C for 0.5 to 24 hours. The removal of t-butoxycarbonyl group is carried out by stirring by using an acid such as TFA or 4N HCI-dioxane at 0 to 40°C for 0.5 to 6 hours. Benzyloxycarbonyl group may be introduced into a free amino group by adding carbobenzoxy chloride in an inert solvent such as 1,4-dioxane, methanol, and further by stirring the mixture at 0 to 40°C for 0.5 to 24 hours. The removal of benzyloxycarbonyl group is carried out by hydrogenation in the presence of a noble metal catalyst such as palladium-carbon (Pd/C). The method for introduction of a modifying group or protecting group for carboxyl group and the method for the removal of the protecting group are explained below. For example, methyl and ethyl ester may be introduced into a free carboxyl group by stirring in an inert solvent such as dichloromethane, in the presence of methanol or ethanol, and dimethylaminopyridine and a condensing agent such as 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride at 0 to 40°C for 0.5 to 24 hours. The removal of these groups may be carried out by stirring in an inert solvent such as methanol in the presence of a base such as 1N aqueous sodium hydroxide solution at 0 to 40°C for 0.5 to 6 hours. The method for introduction of a modifying group or protecting group for amidino group and the method for the removal of the protecting group are explained below. For example, t-butoxycarbonyl group may be introduced in the same manner as used as a protecting group for amino group, or may be introduced into a free amidino group by stirring in an inert solvent such as dichloromethane, acetonitrile, etc., in the presence of N,O-bistrimethylsilylacetamide for 0.5 to 3 hours, then by adding thereto di-t-butyldicarbonate, followed by stirring the mixture at 0 to 40°C for 0.5 to 24 hours. The removal of t-butoxycarbonyl group is carried out by treating with an acid such as TFA or 4N HCI-dioxane with stirring at 0 to 40°C for 0.5 to 6 hours. The introduction of other modifying groups or other protecting group and the removal of the protecting groups are also carried out by a conventional method, for example, by the methods disclosed in Izumiya et al., Fundamental Study and Experiments of Peptide Synthesis (Maruzene, 1985), or Protective Groups in Organic Synthesis (John Wiley & Sons, 1991). The protecting group should be selected to be one which does not cause other modifying groups or protecting groups to remove during the reaction or the removal of said protecting group. The compounds of the formula (5) can be purified by a conventional purifying method, for example, recrystallization, high performance liquid chromatography, etc. The pharmaceutically acceptable salt may be a pharmaceutically acceptable acid addition salt or base addition salt. The acid addition salt is, for example, a salt with an inorganic acid such as hydrochloride, sulfate, phosphate, etc., or a salt with an organic acid such as acetate, butyrate, methanesulfonate, trifluoroacetate, citrate, fumarate, maleate, succinate, salicylate, etc. The base addition salt is a salt with an inorganic base, or a salt with an organic base. The salt with an inorganic base is, for example, an alkali metal salt such as sodium salt, potassium salt, etc., an alkaline earth metal salt such as magnesium salt, calcium salt, etc., or ammonium salt. The salt with an organic base is, for example, a salt with a basic amino acid such as arginine salt, lysine salt, etc. These salts may be prepared by a conventional method. For example, an acetate is prepared by dissolving the compound of the formula (5) in water, followed by adding thereto a necessary amount of acetic acid. The animals to which the present compounds can be administered are not limited, and include, for example, in addition to human, various mammals such as mouse, rat, dog, cat, cow, horse, goat, sheep, rabbit, pig, etc. The present compound may be administered to these animals or human by a conventional administration route, for example, orally, intramuscularly, intravenously, subcutaneously, intraperitoneally, or intranasally. The dosage and the frequency of the administration vary according to kinds of animals to be administered, administration routes, severity of conditions and weights of patients, and should not be limited, but when administered to human, the daily dosage is in the range of about 1 mg to 1 g for an adult, by a single dose, or by multiple doses. The dosage form is in the form of powder, fine granules, granules, tablets, capsules, suppositories, injections, intranasal preparation, etc. These preparations are prepared by using conventional pharmaceutically acceptable carriers or diluents in a conventional manner. That is, a preparation for oral administration is prepared by adding, if necessary, a binder, a disintegrator, a lubricant or a coloring agent, followed converting the mixture to tablets, granules, powders, capsules, by a conventional method. In the preparation of injection preparation, a pH adjustor, a buffering agent, a stabilizer or an emulsifying agent may be added, and the mixture is converted into an injection form, by a conventional manner. The present invention can provide a 2,3-diaminopropionic acid derivative which is useful as a platelet aggregation inhibitor, a cancer metastasis inhibitor, a would healing agent, or a bone resorption inhibitor. Best Mode for Carrying Out the Invention The present invention is illustrated in more detail by the representative compounds of the present invention and Examples, but should not be construed to be limited thereto. The representative compounds of the present invention are exemplified below. A 11 R 1 R 2 CH 2 CONH H Ph CH 2 CONH Et p-MePh A 12 R 1 R 2 CONH H Ph NHCO Me Et CONH Et p-MePh G 5 z y R 2 CO 2 3 Ph CHOH 2 3 Ph A 19 R 1 R 2 CONH Me Ph NHCO Et Et OCH 2 CH2OCOC(CH3)3 Ph Y 7 Y 8 R 1 R 2 N N Me Et N CH Et p-MePh a1 b1 A 20 0 0 O 0 1 NH 1 0 O 1 1 O c1 d1 A 21 0 1 O 0 0 NH Hereinbelow, the present invention is illustrated in more detail by Examples. The following abbreviations are used. Abbreviation Name DMF N,N-Dimethylformamide HOBT·H 2 O 1-Hydroxybenzotriazole hydrate WSC·HCl 1-(3-Dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride TFA Trifluoroacetic acid Z Benzyloxycarbonyl Boc t-Butoxycarbonyl (Boc) 2 O di-t-Butyl dicarbonate THF Tetrahydrofuran BOP reagent Benzotriazolyl-N-hydroxytrisdimethylaminophosphonium hexafluorophosphide salt Example 1 Synthesis of (2S)-3-(3-(4-amidinobenzoylamino)propanoylamino)-2-benzenesulfonylaminopropanoic acid TFA salt: (1) (2S)-3-Amino-2-benzyloxycarbonylaminopropanoic acid N-Z-Asparagine (3.124 g) is dissolved in a mixture of DMF (30 ml) and water (30 ml), and thereto is added bis(trifluoroacetyl)iodobenzene (7.575 g) at room temperature, and the mixture is stirred for 15 minutes. To the mixture is added pyridine (1.874 ml) at room temperature, and the mixture is stirred for four hours. The mixture is evaporated under reduced pressure to remove the solvent, and water (150 ml) is added to the residue. The mixture is washed twice with ether, and the aqueous layer is concentrated under reduced pressure. The residue is crystallized from ethanol-ether to give the title compound (2.149 g). (2) (2S)-2-Benzyloxycarbonylamino-3-(t-butoxycarbonylamino)propanoic acid The product (0.61 g) obtained in the above (1) is dissolved in a mixture of 1,4-dioxane (6 ml) and water (2 ml), and thereto is added (Boc) 2 O (0.62 g) at room temperature, and the mixture is stirred for 1.5 hour. To the mixture is added 1N aqueous sodium hydroxide solution (4 ml), and washed twice with ether. The pH value of the aqueous layer is adjusted to pH 2 with 1N hydrochloric acid, and the mixture is extracted three times with ethyl acetate. The organic layer is washed twice with a saturated brine, and dried over anhydrous magnesium sulfate. The desiccant is removed by filtration, and the filtrate is concentrated under reduced pressure to give the title compound (0.867 g). (3) (2S)-2-Benzyloxycarbonylamino-3-(t-butoxycarbonylamino)propanoic acid methyl ester The product (0.867 g) obtained in the above (2) is dissolved in dichloromethane (15 ml), and thereto are added methanol (1.5 ml), 4-dimethylaminopyridine (34 mg) and WSC·HCl (0.633 g) under ice-cooling. The mixture is stirred under ice-cooling for two hours, and then stirred at room temperature for 12 hours. The mixture is concentrated under reduced pressure to the volume of about 5 ml, and the residue is poured into water. The mixture is extracted three time with ethyl acetate, and the organic layer is washed 1N HCI (twice), a saturated aqueous sodium hydrogen carbonate solution (twice), and with a saturated brine (twice), and then dried over anhydrous magnesium sulfate. The desiccant is removed by filtration, and the filtrate is concentrated under reduced pressure to give the title compound (0.875 g). 1 H-NMR (CDCl 3 ) δ (ppm): 1.42 (9H, s), 3.55 (2H, m), 3.76 (3H, s), 4.42 (1H, m), 4.85 (1H, m), 5.12 (2H, s), 5.80 (1H, m), 7.35 (5H, bs) (4) (2S)-2-Benzyloxycarbonylamino-3-(3-(t-butoxycarbonylamino)propanoylamino)propanoic acid methyl ester The product (6.0 g) obtained in the above (3) is dissolved in acetonitrile (10 ml), and thereto is added dropwise a solution of methanesulfonic acid (8.181 g) in acetonitrile (15 ml) at a temperature below 20°C, and the mixture is stirred at room temperature for 30 minutes. At a temperature below 20°C, to the mixture are added dropwise DMF (20 ml), triethylamine (8.608 g) successively, and the mixture is stirred for 10 minutes. To the mixture are added N-Boc-β-alanine (3.547 g) and HOBT·H 2 O (3.13 g), and then further added thereto WSC-HCI (3.928 g) at a temperature of from 5 to 10°C, and the mixture is stirred for 30 minutes. The mixture is further stirred at room temperature for 12 hours, and poured into water, and extracted three time with ethyl acetate. The organic layer is washed successively with 1N HCI (twice), a saturated aqueous sodium hydrogen carbonate solution (twice) and a saturated brine (twice), and dried over anhydrous magnesium sulfate. The desiccant is removed by filtration, and the filtrate is concentrated under reduced pressure. The residue is purified by silica gel column chromatography (silica gel; 400 g, solvent; chloroform/acetone = 3:1 to 2:1). The fractions containing the title compound are concentrated under reduced pressure to give the title compound (6.974 g). 1 H-NMR (CDCl 3 ) δ (ppm): 1.40 (9H, s), 2.33 (2H, t, J=6 Hz), 3.35 (2H, m), 3.67 (2H, m), 3.78 (3H, s), 4.45 (1H, m), 5.10 (2H, s), 5.20 (1H, m), 5.90 (1H, m), 6.25 (1H, m), 7.30 (5H, bs) (5) (2S)-2-Benzenesulfonylamino-3-(3-(t-butoxycarbonylamino)propanoylamino)propanoic acid methyl ester The product (6.77 g) obtained in the above (4) is dissolved in a mixture of ethanol (50 ml) and ethyl acetate (30 ml), and thereto is added 10 % palladium-carbon (50 % wet) (5 g). The mixture is stirred at room temperature for 2.5 hours under hydrogen atmosphere. The insoluble materials are removed by filtration, and the filtrate is concentrated under reduced pressure. The residue is dissolved in dichloromethane (20 ml), and thereto are added triethylamine (5.36 ml) and benzenesulfonyl chloride (3.69 ml) at room temperature, and the mixture is stirred for 10 minutes. To the mixture are added triethylamine (5.36 ml) and benzenesulfonyl chloride (3.69 ml), and the mixture is further stirred for 20 minutes. The mixture is evaporated under reduced pressure to remove the solvent, and thereto is added ethyl acetate. The mixture is washed successively with 1N hydrochloric acid (twice), a saturated brine (once), a saturated aqueous sodium hydrogen carbonate solution (twice), and a saturated brine (twice), and dried over anhydrous magnesium sulfate. The desiccant is removed by filtration, and the filtrate is concentrated under reduced pressure. The residue is purified by silica gel column chromatography (silica gel; 400 g, solvent; chloroform-methanol = 30:1 (2 liters) to 10:1 (1.5 liter)). The fractions containing the title compound are concentrated under reduced pressure to give the title compound (5.199 g). 1 H-NMR (CDCl 3 ) δ (ppm): 1.44 (9H, s), 2.38 (2H, t, J=6 Hz), 3.40 (2H, m), 3.56 (3H, s), 3.60 (2H, m), 4.06 (1H, m), 5.27 (1H, m), 6.10 (1H, m), 6.57 (1H, m), 7.45-7.65 (3H, m), 7.86 (2H, d, J=7 Hz) (6) 4-Amidinobenzoic acid hydrochloride 4-Amidinobenzamide (commercially available one, 7.8 g) is dissolved in water (200 ml), and thereto is added conc. hydrochloric acid (200 ml), and the mixture is stirred at a temperature below 100°C for 9 hours. The mixture is cooled, and the precipitated crystals are collected by filtration. Yield: 7.6 g MS (SIMS): 165[M+1] + 1 H-NMR (CD 3 OD) δ (ppm): 7.94 (2H, d, J=8.6 Hz), 8.26 (2H, d, J=8.6 Hz) (7) N-t-Butoxycarbonyl-4-amidinobenzoic acid The product (1.772 g) obtained in the above (6) is suspended in dichloromethane (35 ml), and thereto is added N,O-bistrimethylsilylacetamide (7.2 g), and the mixture is stirred at room temperature for one hour. To the mixture is added (Boc) 2 O (3.9 g) at room temperature, and the mixture is stirred for 24 hours. The insoluble materials are removed by filtration, and the filtrate is concentrated under reduced pressure. To the residue is added diethyl ether, and the mixture is stirred. The precipitated crystals are collected by filtration. Yield: 2.334 g 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.55, 1.75 (9H, s), 7.88 (2H, m), 8.09 (2H, m), 6.11-6.77, 7.22-7.40 (1H, m), 9.40, 9.58, 10.48-10.68 (1H, m) (8) (2S)-2-Benzenesulfonylamino-3-(3-(4-(N-t-butoxycarbonylamidino)benzoylamino)propanoylamino)propanoic acid methyl ester The product (0.388 g) obtained in the above (5) is dissolved in acetonitrile (2 ml), and thereto is added dropwise a solution of methanesulfonic acid (0.434 g) in acetonitrile (2 ml) at a temperature below 20°C, and the mixture is stirred at room temperature for 30 minutes. To the mixture are added dropwise DMF (10 ml) and a solution of triethylamine (0.457 g) in DMF (1.5 ml) at a temperature below 20°C, and the mixture is stirred for 10 minutes. To the mixture are added the product (0.263 g) obtained in the above (7) and HOBT·H 2 O (0.167 g). WSC·HCl (0.209 g) is added to the mixture at a temperature of from 5 to 10°C, and the mixture is stirred for 30 minutes. The mixture is further stirred at room temperature for 39 hours, during which triethylamine (18 mg) and WSC·HCl (87 mg) are added thereto at 15 hours thereafter, and 21 hours thereafter, respectively. The reaction mixture is poured into water, and extracted five times with ethyl acetate. The organic layer is washed successively with 1N HCI (twice), a saturated aqueous sodium hydrogen carbonate solution (twice) and a saturated brine (twice), and dried over anhydrous magnesium sulfate. The desiccant is removed by filtration, and the filtrate is concentrated under reduced pressure, and the residue is purified by silica gel column chromatography (silica gel; 50 g, solvent; chloroform-methanol = 10:1). The fractions containing the title compound are concentrated under reduced pressure to give the title compound (0.385 g). MS (SIMS): 576 [M+1] + 1 H-NMR (CDCl 3 ) δ (ppm): 1.53 (9H, s), 2.50 (2H, m), 3.50 (3H, s), 3.50-3.90 (4H, m), 4.10 (1H, m), 7.40-7.70 (4H, m), 7.75-8.03 (9H, m) (9) (2S)-3-(3-(4-Amidinobenzoylamino)propanoylamino)-2-benzene-sulfonylaminopropanic acid TFA salt The product (0.385 g) obtained in the above (8) is dissolved in TFA (5 ml) under ice-cooling, and the mixture is stirred for 30 minutes, and then stirred at room temperature for one hour. The TFA is distilled off, and a mixture of acetic acid (2 ml) and water (8 ml) is added to the residue, and the mixture is refluxed for 11 hours. The reaction mixture is concentrated under reduced pressure, and the residue is purified by HPLC to give the desired compound (97 mg) as a white powder. MS (SIMS): 462 [M+1] + HPLC retention time: 15.7 minutes (Column: YMC-ODS 4.6 mm⊘ x 250 mm, Detection: UV220 nm, Eluent; A solution: 0.1 % TFA/water, B solution: 0.1 % TFA/acetonitrile, Flow rate; 1 ml/min., Gradient; the concentration of B solution is increased from 10 % at a rate of 1 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm): 2.31 (2H, m), 3.05-3.60 (4H, m), 3.90 (1H, m), 7.58 (3H, m), 7.77 (2H, d, J=8 Hz), 7.87 (2H, d, J=8.5 Hz), 8.01 (2H, d, J=8.5 Hz), 7.95-8.20 (2H, m), 8.71 (1H, t, J=6 Hz), 9.29, 9.38 (4H, bs) Example 2 Synthesis of (2S)-2-benzenesulfonylamino-3-(3-(3-(4-piperidyl)propanoylamino)propanoylamino)propanoic acid TFA salt (1) (1-t-Butoxycarbonyl-4-piperidyl)methanol Isonipeconic acid (20 g) is dissolved in a mixture of 1,4-dioxane (150 ml) and 1N NaOH (170 ml), and thereto is added (Boc) 2 O (37.1 g) at a room temperature, and the mixture is stirred for 24 hours. The pH value of the mixture is adjusted to pH 2 with 1N hydrochloric acid, and extracted three times with ethyl acetate. The organic layer is washed twice with a saturated brine, and then dried over anhydrous magnesium sulfate. The desiccant is removed by filtration, and the filtrate is concentrated under reduced pressure to give a Boc compound (33.9 g). The Boc compound (20.0 g) is dissolved in dichloremethane (400 ml), and thereto are added triethylamine (9.7 g), N-hydroxysuccinimide (11.0 g) and WSC·HCl (18.4 g), and the mixture is stirred at room temperature for three hours. The reaction mixture is diluted with dichloromethane, washed twice with water, and dried over anhydrous magnesium sulfate. The desiccant is removed by filtration, and the filtrate is concentrated under reduced pressure to give a white solid (29.0 g). To a solution of the white solid (25.6 g) in tetrahydrofuran (400 ml) is added sodium borohydride (7.42 g). The mixture is stirred at room temperature for 2.5 hours, and stirred at 50°C for 15 minutes. The reaction solution is allowed to cool, and thereto is added 10 % aqueous ammonium chloride solution (200 ml), and the mixture is extracted three times with ethyl acetate. The extract is washed with water and a saturated brine, and dried over anhydrous magnesium sulfate. The desiccant is removed by filtration, and the filtrate is concentrated under reduced pressure. The residue is purified by silica gel column chromatography (silica gel; 500 g, solvent; hexane-ethyl acetate = 1:1). The fractions containing the title compound are concentrated under reduced pressure to give a white solid (13.0 g). (2) (1-t-Butoxycarbonyl-4-piperidine)carboxyaldehyde To a solution of dimethylsulfoxide (2.2 ml) in dichloromethane (30 ml) is added oxalyl chloride (2.05 ml) at -78°C, and the mixture is stirred for five minutes. To the mixture is added dropwise a solution of the product (2.0 g) obtained in the above (1) in dichloromethane (10 ml), and the mixture is further stirred for 15 minutes. Triethylamine (5.2 ml) is added to the mixture, and the mixture is warmed to room temperature, and stirred for 30 minutes. To the reaction solution is added water, and the mixture is extracted three times with ethyl acetate. The organic layer is washed successively with 1N hydrochloric acid (twice), a saturated brine (once), a saturated aqueous sodium hydrogen carbonate solution (twice) and a saturated brine (twice), and dried over anhydrous magnesium sulfate. The desiccant is removed by filtration, and the filtrate is concentrated under reduced pressure to give the title compound (1.98 g). (3) 3-(1-t-Butoxycarbony-4-piperidyl)propanoic acid To a solution of ethyl diethyl phosphonoacetate (2.50 g) in THF (10 ml) is added 60 % NaH (410 mg) in portions at a temperature below 40°C under nitrogen atmosphere, and the mixture is stirred for 10 minutes. To the mixture is added dropwise a solution of the compound (1.98 g) obtained in the above (2) in THF (10 ml) at a temperature below 35°C, and the mixture is stirred at room temperature for two hours. To the reaction solution is added water, and the mixture is extracted three times with ethyl acetate. The extract is washed successively with 1N hydrochloric acid (twice), a saturated brine (once), a saturated aqueous sodium hydrogen carbonate solution (twice) and a saturated brine (twice), and dried over anhydrous magnesium sulfate. The desiccant is removed by filtration, and the filtrate is concentrated under reduced pressure. The residue is purified by silica gel column chromatography (silica gel; 100 g, solvent; hexane-ethyl acetate = 4:1). The fractions containing the desired compound are concentrated under reduced pressure to give an ester compound (2.43 g) as an oily product. The ester compound (2.43 g) is dissolved in ethanol (15 ml), and thereto is added 10 % palladium-carbon (50 % wet, 1.54 g). The mixture is stirred at room temperature for three hours under hydrogen atmosphere. The insoluble materials are removed by filtration, and the filtrate is concentrated under reduced pressure. The residue is dissolved in methanol (20 ml), and thereto is added 1N NaOH (13 ml), and the mixture is stirred at room temperature for three hours. The mixture is evaporated under reduced pressure to remove the methanol, and the pH value thereof is adjusted to pH 2 with 1N HCI, and the mixture is extracted three times with ethyl acetate. The extract is washed twice with a saturated brine, and dried over anhydrous magnesium sulfate. The desiccant is removed by filtration, and the filtrate is concentrated under reduced pressure to give a white solid (1.90 g). 1 H-NMR (CDCl 3 ) δ (ppm): 1.00-1.20 (2H, m), 1.45 (9H, s), 1.55-1.72 (5H, m), 2.39 (2H, t, J=7 Hz), 2.67 (2H, t, J=13 Hz), 4.00-4.20 (2H, m) (4) (2S)-2-Benzyloxycarbonylamino-3-(3-(3-(1-t-butoxycarbonyl-4-piperidyl)propanoylamino)propanoylamino)propanoic acid methyl ester The compound (0.2 g) obtained in Example 1-(4) is dissolved in acetonitrile (2.5 ml), and thereto is added dropwise a solution of methanesulfonic acid (0.227 g) in acetonitrile (1.5 ml) at a temperature below 20°C, and the mixture is stirred at room temperature for 30 minutes. To the mixture are added dropwise DMF (4 ml) and triethylamine (0.239 g) at a temperature below 20°C, and the mixture is stirred for 10 minutes. To the mixture are added the product (0.134 g) obtained in the above (3), HOBT·H 2 O (87 mg), and then further thereto is added WSC·HCl (0.109 g) at a temperature of from 5 to 10°C. The mixture is stirred for 30 minutes, and further stirred at room temperature for 12 hours. The mixture is poured into water, and the mixture is extracted three times with ethyl acetate. The organic layer is washed successively with 1N HCI (twice), a saturated aqueous sodium hydrogen carbonate solution (twice), a saturated brine (twice), and dried over anhydrous magnesium sulfate. The desiccant is removed by filtration, and the filtrate is concentrated under reduced pressure. The residue is purified by silica gel column chromatography (silica gel; 30 g, solvent; chloroform-acetone = 1:1). The fractions containing the title compound are concentrated under reduced pressure to give the title compound (0.272 g). 1 H-NMR (CDCl 3 ) δ (ppm): 0.95-1.15 (2H, m), 1.45 (9H, s), 1.30-1.85 (5H, m), 2.11-2.22 (2H, m), 2.25-2.40 (2H, m), 2.63 (2H, dd, J=12, 12 Hz), 3.37-3.80 (4H, m), 3.76 (3H, s), 3.95-4.15 (2H, m), 4.38-4.50 (1H, m), 5.10 (2H, s), 5.85-5.95 (1H, m), 6.32 (1H, m), 6.38-6.50 (1H, m), 7.35 (5H, s) (5) (2S)-2-Amino-3-(3-(3-(1-t-butoxycarbonyl-4-piperidyl)propanoylamino)propanoylamino)propanoic acid methyl ester The compound (0.578 g) obtained in the above (4) is dissolved in ethanol (15 ml), and thereto is added 10 % palladium-carbon (50 % wet, 0.4 g), and the mixture is stirred at room temperature for four hours under hydrogen atmosphere. The insoluble materials are removed by filtration, and the filtrate is concentrated under reduced pressure to give the title compound (398 mg). (6) (2S)-2-Benzenesulfonylamino-3-(3-(3-(1-t-butoxycarbonyl-4-piperidyl)propanoylamino)propanoylamino)propanoic acid methyl ester The compound (120 mg) obtained in the above (5) is dissolved in dichloromethane (3 ml), and thereto are added triethylamine (98 µl) and benzenesulfonyl chloride (54 µl) at room temperature, and the mixture is stirred for 30 minutes. Triethylamine (98 µl) and benzenesulfonyl chloride (81 µl) are further added, and the mixture is stirred for 90 minutes. The mixture is evaporated under reduced pressure to remove the solvent, and to the residue is added ethyl acetate. The mixture is washed successively with 1N hydrochloric acid (twice), a saturated brine (once), a saturated aqueous sodium hydrogen carbonate solution (twice) and a saturated brine (twice), and dried over anhydrous magnesium sulfate. The desiccant is removed by filtration, and the filtrate is concentrated under reduced pressure. The residue is purified by silica gel column chromatography (silica gel; 20 g, solvent; chloroform-methanol = 30:1 to 10:1). The fractions containing the title compound are concentrated under reduced pressure to give the title compound (151 mg). 1 H-NMR (CDCl 3 ) δ (ppm): 0.98-1.17 (2H, m), 1.44 (9H, s), 1.30-1.70 (5H, m), 2.10-2.58 (4H, m), 2.65 (2H, dd, J=12, 12 Hz), 3.45-3.75 (4H, m), 3.52 (3H, s), 3.96-4.20 (3H, m), 6.28-6.37 (1H, m), 6.56-6.76 (1H, m), 6.98-7.08 (1H, m), 7.46-7.62 (3H, m), 7.80-7.88 (2H, m) (7) (2S)-2-Benzenesulfonylamino-3-(3-(3-(4-piperidyl)propanoylamino)propanoylamino)propanoic acid TFA salt The compound (151 mg) obtained in the above (6) is dissolved in a mixture of methanol (4 ml) and THF (4 ml), and thereto is added 1N aqueous lithium hydroxide solution (4 ml). The mixture is stirred at room temperature for three hours, and evaporated under reduced pressure to remove the solvent. The pH value of the residue is adjusted to pH 2 with 1N HCI, and extracted three times with ethyl acetate. The extract is washed twice with a saturated brine, and dried over anhydrous magnesium sulfate. The desiccant is removed by filtration, and the filtrate is concentrated under reduced pressure. The residue is dissolved in TFA (5 ml) under ice-cooling, and stirred for one hour. The reaction mixture is concentrated under reduced pressure, and the residue is purified by HPLC to give a white powder (113 mg). MS (SIMS): 455 [M+1] + HPLC retention time: 14.3 min. (Column: YMC-ODS 4.6 mm⊘ x 250 mm, Detection: UV220 nm, Eluent; A solution: 0.1 % TFA/water, B solution: 0.1 % TFA/acetonitrile, Flow rate; 1 ml/min., Gradient; the concentration of B solution is increased from 10 % at a rate of 1 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.21 (2H, m), 1.45 (3H, m), 1.77 (2H, m), 2.00-2.20 (4H, m), 2.82 (2H, m), 3.03-3.35 (6H, m), 3.88 (1H, m), 7.58 (3H, m), 7.80 (3H, m), 7.97 (1H, t, J=5.5 Hz), 8.11 (1H, d, J=9 Hz), 8.22 (1H, bs), 8.55 (1H, bs) Example 3 Synthesis of (2S)-2-butanesulfonylamino-3-(3-(3-(4-piperidyl)propanoylamino)propanoylamino)propanoic acid TFA salt (1) (2S)-2-Butanesulfonylamino-3-(3-(3-(1 -t-butoxycarbonyl-4-piperidyl)propanoylamino)propanoylamino)propanoic acid methyl ester The compound (0.272 g) obtained in Example 2-(5) is dissolved in ethyl acetate (10 ml), and thereto are added sodium hydrogen carbonate (295 mg) and 1-butanesulfonyl chloride (91 µl) at room temperature, and the mixture is refluxed for 8 hours. The mixture is evaporated under reduced pressure to remove the solvent, and to the residue is added ethyl acetate. The mixture is washed successively with 1N hydrochloric acid (twice), a saturated brine (once), a saturated aqueous sodium hydrogen carbonate solution (twice) and a saturated brine (twice), and dried over anhydrous magnesium sulfate. The desiccant is removed by filtration, and the filtrate is concentrated under reduced pressure to give the title compound (192 mg). 1 H-NMR (CDCl 3 ) δ (ppm): 0.90-1.18 (7H, m), 1.45 (9H, s), 1.30-2.11 (7H, m), 2.20-2.30 (2H, m), 2.33-2.55 (2H, m), 2.66 (2H, dd, J=12, 12 Hz), 3.04 (2H, dd, J=8 Hz), 3.44-3.70 (4H, m), 3.79 (3H, s), 4.06 (2H, d, J=12 Hz), 4.30 (1H, m), 6.03 (1H, m), 6.78 (1H, m), 7.09 (1H, m) (2) (2S)-2-Butanesulfonylamino-3-(3-(3-(4-piperidyl)propanoylamino)propanoylamino)propanoic acid TFA salt The compound (192 mg) obtained in the above (1) is dissolved in a mixture of methanol (6 ml) and THF (3 ml), and thereto is added 4N aqueous lithium hydroxide solution (1.75 ml), and the mixture is stirred at room temperature for one hour. The mixture is evaporated under reduced pressure, and the pH value of the residue is adjusted to pH 2 with 1N HCI and extracted three times with ethyl acetate. The extract is washed twice with a saturated brine, and dried over anhydrous magnesium sulfate. The desiccant is removed by filtration, and the filtrate is concentrated under reduced pressure. The residue is dissolved in TFA (5 ml) under ice-cooling, and the mixture is stirred for one hour. The reaction mixture is concentrated under reduced pressure. The residue is purified by HPLC to give a white powder (108 mg). MS (SIMS): 435 [M+1] + HPLC retention time: 13.3 min. (Column: YMC-ODS 4.6 mm⊘ x 250 mm, Detection: UV220 nm, Eluent; A solution: 0.1 % TFA/water, B solution: 0.1 % TFA/acetonitrile, Flow rate; 1 ml/min., Gradient; the concentration of B solution is increased from 10 % at a rate of 1 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm): 0.87 (3H, t, J=7 Hz), 1.10-1.58 (7H, m), 1.65 (2H, m), 1.78 (2H, m), 2.06 (2H, t, J=7 Hz), 2.23 (2H, t, J=7 Hz), 2.83 (2H, m), 2.97 (2H, t, J=6 Hz), 3.10-3.50 (6H, m), 3.98 (1H, m), 7.52 (1H, d, J=9 Hz), 7.75 (1H, t, J=5 Hz), 8.03 (1H, t, J=5 Hz), 8.20 (1H, bs), 8.50 (1H, bs) Example 4 (2S)-2-Benzyloxycarbonylamino-3-(3-(3-(4-piperidyl)propanoylamino)propanoylamino)propanoic acid TFA salt The compound (0.12 g) obtained in Example 2-(4) is dissolved in a mixture of methanol (3 ml) and THF (2 ml), and thereto is added 2N aqueous lithium hydroxide solution (2 ml), and the mixture is stirred at room temperature for one hour. The mixture is evaporated under reduced pressure to remove the solvent, and the pH value thereof is adjusted to pH 2 with 1N HCI, and the mixture is extracted three time with ethyl acetate. The extract is washed twice with a saturated brine, and dried over anhydrous magnesium sulfate. The desiccant is removed by filtration, and the filtrate is concentrated under reduced pressure. The residue is dissolved in 4N HCI in 1,4-dioxane (5 ml) under ice-cooling, and the mixture is stirred for one hour. The reaction mixture is concentrated under reduced pressure, and the residue is purified by HPLC to give a white powder (104 mg). MS (SIMS): 449 [M+1] + HPLC retention time: 18.9 min. (Column: YMC-ODS 4.6 mmØ x 250 mm, Detection: UV220 nm, Eluent; A solution: 0.1 % TFA/water, B solution: 0.1 % TFA/acetonitrile, Flow rate; 1 ml/min., Gradient; the concentration of B solution is increased from 10 % at a rate of 1 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.20 (2H, m), 1.43 (3H, m), 1.78 (2H, m), 2.05 (2H, t, J=7 Hz), 2.22 (2H, t, J=7 Hz), 2.81 (2H, m), 3.15-3.70 (6H, m), 4.11 (1H, m), 5.03 (2H, s), 7.36 (5H, bs), 7.50 (1H, d, J=8 Hz), 7.78 (1H, m), 8.02 (1H, m), 8.15 (1H, bs), 8.50 (1H, bs) The chemical structures of the compounds obtained in Example 1 to 4 are as follows. Example 1 Example 2 Example 3 Example 4 Example 9 Synthesis of (2R)-2-butanesulfonylamino-3-(3-(3-(4-piperidyl)propanoylamino)propanoylamino)propanoic acid TFA salt The title compound is prepared from N-benzyloxycarbonyl-D-asparagine in the same manner as in Example 1 or 2. Yield: 64 mg MS (SIMS): 435 [M+1] + HPLC retention time: 13.3 min. (Column: YMC-ODS 4.6 mmØ x 250 mm, Detection: UV 220 nm, Eluent; A solution; 0.1 % TFA/water, B solution; 0.1 % TFA/acetonitrile, Flow rate: 1 ml/min., Gradient: The concentration of the B solution is increased from 10 % at a rate of 1 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm): 0.87 (3H, t, J=7 Hz), 1.10-1.58 (7H, m), 1.65 (2H, m), 1.78 (2H, m), 2.06 (2H, t, J=7 Hz), 2.23 (2H, t, J=7 Hz), 2.82 (2H, m), 2.97 (2H, t, J=6 Hz), 3.20 (4H, m), 3.42 (2H, m), 4.00 (1H, m), 7.52 (1H, d, J=9 Hz), 7.76 (1H, t, J=5 Hz), 8.03 (1H, t, J=5 Hz), 8.20 (1H, bs), 8.50 (1H, bs) Example 10 Synthesis of (2S)-2-benzylsulfonylamino-3-(3-(3-(4-piperidyl)propanoylamino)propanoylamino)propanoic acid TFA salt The title compound is prepared from the compound obtained in Example 2-(5) in the same manner as in Example 3. Yield: 170 mg MS (SIMS): 469 [M+1] + HPLC retention time: 16.2 min. (Column: YMC-ODS 4.6 mmØ x 250 mm, Detection: UV 220 nm, Eluent; A solution; 0.1 % TFA/water, B solution; 0.1 % TFA/acetonitrile, Flow rate: 1 ml/min., Gradient: The concentration of the B solution is increased from 10 % at a rate of 1 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.20 (2H, m), 1.42 (3H, m), 1.75 (2H, m), 2.04 (2H, t, J=6.5 Hz), 2.23 (2H, t, J=7 Hz), 2.80 (2H, m), 3.26 (4H, m), 3.40 (2H, m), 3.90-4.20 (1H, m), 4.38 (2H, s), 7.37 (5H, m), 7.55 (1H, d, J=9 Hz), 7.76 (1H, t, J=5 Hz), 7.99 (1H, t, J=6 Hz), 8.20 (1H, bs), 8.50 (1H, bs) The chemical structures of the compounds of Example 9 and 10 are as follows. Example 9 Example 10 Example 11 Synthesis of (2S)-2-pentanoylamino-3-(3-(3-(4-piperidyl)propanoylamino)propanoylamino)propanoic acid TFA salt (1) (2S)-3-(3-(3-(1-t-Butoxycarbonyl-4-piperidyl)propanoylamino)propanoylamino)-2-pentanoylaminopropanoic acid methyl ester The compound (100 mg) obtained in Example 2-(5) is dissolved in dichloromethane (2.5 ml) and thereto are added triethylamine (65 µl) and n-valeric anhydride (51 µl), and the mixture is stirred at room temperature for one hour. The reaction mixture is diluted with water, and extracted three times with ethyl acetate. The organic layer is washed successively with 1N hydrochloric acid (twice), a saturated brine (once), a saturated aqueous sodium hydrogen carbonate solution (twice) and a saturated brine (twice), and dried over anhydrous magnesium sulfate. The desiccant is removed by filtration, and the filtrate is concentrated under reduced pressure to give the title compound as a white powder (103 mg). 1 H-NMR (CDCl 3 ) δ (ppm): 0.88-0.98 (3H, m), 1.00-1.18 (2H, m), 1.30-1.48 (4H, m), 1.45 (9H, s), 1.52-1.85 (5H, m), 2.15-2.30 (2H, m), 2.35-2.50 (4H, m), 2.66 (2H, dd, J=12 Hz), 3.57-3.70 (4H, m), 3.77 (3H, s), 4.00-4.15 (2H, m), 4.60-4.70 (1H, m), 6.41 (1H, m), 6.67 (1H, m), 6.77 (1H, d, J=7 Hz) (2) (2S)-3-(3-(3-(4-Piperidyl)propanoylamino)propanoylamino)-2pentanoylaminopropanoic acid TFA salt The title compound is prepared from the compound obtained in the above (1) in the same manner as in Example 4. Yield: 88 mg MS (SIMS): 399 [M+1] + HPLC retention time: 11.1 min. (Column: YMC-ODS 4.6 mmØ x 250 mm, Detection: UV 220 nm, Eluent; A solution; 0.1 % TFA/water, B solution; 0.1 % TFA/acetonitrile, Flow rate: 1 ml/min., Gradient: The concentration of the B solution is increased from 10 %atarate of 1 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm): 0.85 (3H, t, J=7 Hz), 1.27 (4H, m), 1.46 (5H, m), 1.80 (2H, m), 2.03-2.18 (4H, m), 2.20 (2H, t, J=7 Hz), 2.81 (2H, m), 3.23 (4H, m), 3.46 (2H, m), 4.30 (1H, m), 7.78 (1H, m), 8.00 (2H, m), 8.20 (1H, bs), 8.50 (1H, bs) The chemical structure of the compound obtained in Example 11 is as follows: Example 11 Example 17 Platelet aggregation inhibitory activity Method: The blood was collected from the elbow vein of a normal male volunteer with mixing thereof with 1/10 volume of 3.8 % sodium citrate, and the blood was centrifuged at 1000 rpm (150 g) for 10 minutes to give the supernatant as platelet rich plasma (PRP). To PRP (200 µl) was added a test compound solution (2 µl), and the mixture was incubated with stirring at 1000 rpm at 37°C for two minutes, and thereto was added a platelet aggregator, adenosine diphosphate (ADP, 22 µl) at a final concentration of 3 µg/ml. The platelet aggregation activity was determined by nephelometric analysis using a Hematracer (manufactured by Niko Bioscience, Ltd.). The test results of platelet aggregation inhibitory activity are expressed by IC 50 , which is a concentration of the test compound being required to inhibit the platelet aggregation reaction by 50 %. The test results of the test compounds are shown in Table 1. Test results Test Compound IC 50 (M) The compound of Example 1 1.60 x 10 -8 The compound of Example 2 3.96 x 10 -8 The compound of Example 3 1.62 x 10 -7 The compound of Example 4 5.13 x 10 -7 The compound of Example 9 3.63 x 10 -6 The compound of Example 10 2.32 x 10 -7 The compound of Example 11 8.73 x 10 -6 Example 18 Synthesis of (2S)-3-(3-(4-amidinobenzoylamino)propanoylamino)-2-(4-methoxy)benzenesulfonylaminopropanoic acid TFA salt The title compound is prepared in the same manner as in Example 19. Yield: 98 mg MS (SIMS): 492 [M+1] + HPLC retention time: 16.7 min. (Column: YMC-ODS 4.6 mmØ x 250 mm, Detection: UV 220 nm, Eluent; A solution; 0.1 % TFA/water, B solution; 0.1 % TFA/acetonitrile, Flow rate: 1 ml/min., Gradient: The concentration of the B solution is increased from 10 % at a rate of 1 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm): 2.22-2.38 (2H, m), 3.05-3.30 (4H, m), 3.81 (3H, s), 3.71-3.90 (1H, m), 7.07 (2H, d, J=9 Hz), 7.69 (2H, d, J=6.9 Hz), 7.80-8.08 (6H, m), 8.65-8.75 (1H, m), 9.00-9.42 (4H, m) Example 19 Synthesis of (2S)-3-(3-(4-amidinobenzoylamino)propanoylamino)-2-(2,4,6-trimethyl)benzenesulfonylaminopropanoic acid TFA salt (1) (2S)-3-(3-(4-Cyanobenzoylamino)propanoylamino)-2-(2,4,6-trimethyl)benzenesulfonylaminopropanoic acid ethyl ester To a solution of (2S)-2-(2,4,6-trimethyl)benzenesulfonylamino-3-(3-(t-butoxycarbonylamino)propanoylamino)propanoic acid ethyl ester (0.579 g) obtained in the same manner as in Example 1-(3), -(4) and -(5) in acetonitrile (2 ml) is added dropwise a solution of methanesulfonic acid (0.573 g) in acetonitrile (2 ml) at a temperature below 20°C, and the mixture is stirred at room temperature for 30 minutes. To the mixture are added dropwise DMF (10 ml) and triethylamine (0.615 g) at a temperature below 20°C, and the mixture is stirred for 10 minutes. 4-Cyanobenzoic acid (0.193 g) and HOBT·H 2 O (0.177 g) are added thereto, and thereto is further added WSC·HCl (0.251 g) at a temperature of from 5 to 10°C. The mixture is stirred for 30 minutes, and further stirred at room temperature for 12 hours. The reaction mixture is poured into water, and extracted three times with ethyl acetate. The organic layer is washed successively with 1N hydrochloric acid (twice), a saturated aqueous sodium hydrogen carbonate solution (twice) and a saturated brine (twice), and dried over anhydrous magnesium sulfate. The desiccant is removed by filtration, and the filtrate is concentrated under reduced pressure to give a residue. (2) (2S)-3-(3-(4-Amidinobenzoylamino)propanoylamino)-2-(2,4,6-trimethyl)benzenesulfonylaminopropanoic acid TFA salt The compound obtained in the above (1) is dissolved in a mixture of pyridine (12.5 ml) and triethylamine (2.5 ml), and thereto is blown hydrogen sulfide gas at room temperature for one hour, and then the mixture is allowed to stand for 12 hours. The hydrogen sulfide is removed by blowing nitrogen gas into the mixture, and the mixture is concentrated under reduced pressure. To the residue are added acetone (25 ml) and methyl iodide (0.5 ml), and the mixture is heated with stirring at 50-60°C for three hours. After cooling, the mixture is concentrated under reduced pressure, and methanol (25 ml) and ammonium acetate (0.309 g) are added to the residue. The mixture is heated with stirring at 70-80°C for 1 hour and 45 minutes. The mixture is concentrated under reduced pressure, and 1N hydrochloric acid (20 ml) and acetic acid (20 ml) are added to the residue, and the mixture is heated with stirring at 60-70°C for 18 hours. The reaction mixture is concentrated under reduced pressure, and the residue is purified by HPLC to give a white powder (36 mg). MS (SIMS): 504 [M+1] + HPLC retention time: 24.1 min. (Column: YMC-ODS 4.6 mmØ x 250 mm, Detection: UV 220 nm, Eluent; A solution; 0.1 % TFA/water, B solution; 0.1 % TFA/acetonitrile, Flow rate: 1 ml/min., Gradient: The concentration of the B solution is increased from 10 % at a rate of 1 %/min. ) 1 H-NMR (DMSO-d 6 ) δ (ppm): 2.17-2.30 (5H, m), 2.54 (6H, s), 3.13 (2H, m), 3.25-3.40 (2H, m), 3.84 (1H, m), 6.98 (2H, s), 7.86-8.03 (6H, m), 8.70 (1H, t, J=5.9 Hz), 9.27 (2H, m), 9.41 (2H, m) Example 20 Synthesis of (2S)-3-(3-(4-amidinobenzoylamino)propanoylamino)-2-(1-naphthalene)sulfonylamino)propanoic acid TFA salt The title compound is prepared in the same manner as in Example 19. Yield: 36 mg MS (SIMS): 512 [M+1] + HPLC retention time: 21.9 min. (Column: YMC-ODS 4.6 mmØ x 250 mm, Detection: UV 220 nm, Eluent; A solution; 0.1 % TFA/water, B solution; 0.1 % TFA/acetonitrile, Flow rate: 1 ml/min., Gradient: The concentration of the B solution is increased from 10 % at a rate of 1 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm): 2.05-2.28 (2H, m), 3.00-3.50 (4H, m), 3.85-3.95 (1H, m), 7.58-7.72 (3H, m), 7.72-8.14 (8H, m), 8.20, 8.48 (1H, d (J=7 Hz), d (J=8 Hz)), 8.61-8.68 (2H, m), 9.16 (2H, m), 9.39 (2H, s) Example 21 Synthesis of (2S)-3-(3-(4-amidinobenzoylamino)propanoylamino)-2-(2-trifluoromethyl)benzenesulfonylaminopropanoic acid TFA salt The title compound is prepared in the same manner as in Example 19. Yield: 71 mg MS (SIMS): 530 [M+1] + HPLC retention time: 20.7 min. (Column: YMC-ODS 4.6 mmØ x 250 mm, Detection: UV 220 nm, Eluent; A solution; 0.1 % TFA/water, B solution; 0.1 % TFA/acetonitrile, Flow rate: 1 ml/min., Gradient: The concentration of the B solution is increased from 10 % at a rate of 1 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm): 2.33 (2H, m), 3.25 (2H, m), 3.50-3.90 (2H, m), 4.00 (1H, m), 7.77-7.97 (5H, m), 8.01 (2H, m), 8.12 (2H, m), 8.22 (1H, d, J=8.9 Hz), 8.72 (1H, t, J=5.3 Hz), 9.25 (2H, m), 9.40 (2H, m) Example 22 Synthesis of (2S)-3-(3-(4-amidinobenzoylamino)propanoylamino)-2-benzenesulfonylaminopropanoic acid ethyl ester (2S)-2-Benzenesulfonylamino-3-(3-(4-(N-t-butoxycarbonylamidino)benzoylamino)propanoylamino)propanoic acid ethyl ester (1.48 g) obtained in the same manner as in the synthesis of the compound of Example 1-(8) is dissolved in TFA (50 ml) under ice-cooling, and the mixture is stirred at room temperature for one hour. The reaction mixture is concentrated under reduced pressure, and the residue is washed with ether, and purified by HPLC to give the title compound (448 mg) as a colorless powder. MS (SIMS): 490 [M+1] + HPLC retention time: 17.7 min. (Column: YMC-ODS 4.6 mmØ x 250 mm, Detection: UV 220 nm, Eluent; A solution; 0.1 % TFA/water, B solution; 0.1 % TFA/acetonitrile, Flow rate: 1 ml/min., Gradient: The concentration of the B solution is increased from 10 % at a rate of 2 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm): 0.98 (3H, t, J=7 Hz), 2.32 (2H, t, J=7 Hz), 3.10-3.20 (4H, m), 3.77 (2H, q, J=7 Hz), 3.90-4.00 (1H, m), 7.52-7.68 (3H, m), 7.75 (2H, dd, J=2 Hz, 8 Hz), 7.88 (2H, d, J=8 Hz), 8.01 (2H, d, J=8 Hz), 8.08 (1H, m), 8.36 (1H, d, J=10 Hz), 8.72 (1H, m), 9.00-9.42 (4H, m) Example 23 Synthesis of (2S)-3-(3-(4-amidinobenzoylamino)propanoylamino)-2-benzenesulfonylaminopropanoic acid methyl ester The title compound is prepared in the same manner as in Example 22. Yield: 58 mg MS (SIMS): 476 [M+1] + HPLC retention time: 23.9 min. (Column: YMC-ODS 4.6 mmØ x 250 mm, Detection: UV 220 nm, Eluent; A solution; 0.1 % TFA/water, B solution; 0.1 % TFA/acetonitrile, Flow rate: 1 ml/min., Gradient: The concentration of the B solution is increased from 10 % at a rate of 1 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm): 2.31 (2H, t, J=8 Hz), 3.10-3.40 (4H, m), 3.40 (2H, s), 3.90-4.10 (1H, m), 7.50-7.69 (3H, m), 7.73 (2H, dd, J=2 Hz, 5 Hz), 7.77 (2H, d, J=2 Hz, 9 Hz), 8.01 (2H, dd, J=2 Hz, 9 Hz), 8.08 (1H, t, J=6 Hz), 8.37 (1H, d, J=9 Hz), 8.71 (1H, t, J=6 Hz), 9.19 (2H, bs), 9.40 (2H, bs) The chemical structures of the compounds obtained in Examples 18 to 23 are as follows. Example 24 Synthesis of (2S)-2-(2-methyl)benzenesulfonylamino-3-(3-(3-(4-piperidyl)propanoylamino)propanoylamino)propanoic acid TFA salt The title compound is prepared in the same manner as in Example 2. Yield: 102 mg MS (SIMS): 469 [M+1] + HPLC retention time: 18.2 min. (Column: YMC-ODS 4.6 mmØ x 250 mm, Detection: UV 220 nm, Eluent; A solution; 0.1 % TFA/water, B solution; 0.1 % TFA/acetonitrile, Flow rate: 1 ml/min., Gradient: The concentration of the B solution is increased from 10 % at a rate of 1 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.23 (2H, m), 1.43 (3H, m), 1.77 (2H, m), 2.06 (4H, m), 2.59 (3H, s), 2.80 (2H, m), 3.10-3.40 (6H, m), 3.82 (1H, m), 7.37 (2H, m), 7.49 (1H, m), 7.70-7.80 (2H, m), 7.97 (1H, t, J=5.4 Hz), 8.14 (1H, d, J=9.2 Hz), 8.20 (1H, m), 8.50 (1H, m) Example 25 Synthesis of (2S)-2-(3-methyl)benzenesulfonylamino-3-(3-(3-(4-piperidyl)propanoylamino)propanoylamino)propanoic acid TFA salt The title compound is prepared in the same manner as in Example 2. Yield: 180 mg MS (SIMS): 469 [M+1] + HPLC retention time: 18.9 min. (Column: YMC-ODS 4.6 mmØ x 250 mm, Detection: UV 220 nm, Eluent; A solution; 0.1 % TFA/water, B solution; 0.1 % TFA/acetonitrile, Flow rate: 1 ml/min., Gradient: The concentration of the B solution is increased from 10 % at a rate of 1 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.23 (2H, m), 1.43 (3H, m), 1.77 (2H, m), 2.06 (4H, m), 2.37 (3H, s), 2.80 (2H, m), 3.10-3.40 (6H, m), 3.88 (1H, m), 7.41 (2H, m), 7.56 (1H, m), 7.57 (1H, s), 7.74 (1H, t, J=5.6 Hz), 7.97 (1H, t, J=4.8 Hz), 8.07 (1H, d, J=8.9 Hz), 8.21 (1H, m), 8.52 (1H, m) Example 26 Synthesis of (2S)-2-(4-methyl)benzenesulfonylamino-3-(3-(3-(4-piperidyl)propanoylamino)propanoylamino)propanoic acid TFA salt The title compound is prepared in the same manner as in Example 2. Yield: 40 mg MS (SIMS): 469 [M+1] + HPLC retention time: 20.0 min. (Column: YMC-ODS 4.6 mmØ x 250 mm, Detection: UV 220 nm, Eluent; A solution; 0.1 % TFA/water, B solution; 0.1 % TFA/acetonitrile, Flow rate: 1 ml/min., Gradient: The concentration of the B solution is increased from 10 % at a rate of 1 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.23 (2H, m), 1.43 (3H, m), 1.77 (2H, m), 2.06 (4H, m), 2.36 (3H, s), 2.81 (2H, m), 3.03-3.35 (6H, m), 3.85 (1H, m), 7.35 (2H, d, J=7.9 Hz), 7.64 (2H, d, J=8.6 Hz), 7.73 (1H, t, J=5.3 Hz), 7.96 (1H, t, J=5.6 Hz), 8.03 (1H, d, J=8.9 Hz), 8.13 (1H, m), 8.47 (1H, m) Example 27 Synthesis of (2S)-3-(3-(3-(4-piperidyl)propanoylamino)-2-(2-trifluoromethyl)benzenesulfonylaminopropanoic acid TFA salt The title compound is prepared in the same manner as in Example 2. Yield: 161 mg MS (SIMS): 523 [M+1] + HPLC retention time: 21.1 min. (Column: YMC-ODS 4.6 mmØ x 250 mm, Detection: UV 220 nm, Eluent; A solution; 0.1 % TFA/water, B solution; 0.1 % TFA/acetonitrile, Flow rate: 1 ml/min., Gradient: The concentration of the B solution is increased from 10 % at a rate of 1 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.22 (2H, m), 1.43 (3H, m), 1.76 (2H, m), 2.06 (2H, m), 2.16 (2H, m), 2.80 (2H, m), 3.10-3.40 (6H, m), 4.00 (1H, m), 7.75 (1H, t, J=5.3 Hz), 7.83 (2H, m), 7.95 (1H, m), 8.05 (1H, t, J=5.9 Hz), 8.12 (1H, m), 8.21 (1H,d, J=8.9 Hz), 8.20 (1H,m), 8.55 (1H,m) Example 28 Synthesis of (2S)-3-(3-(3-(4-piperidyl)propanoylamino)propanoylamino)-2-(3-trifluoromethyl)benzenesulfonylaminopropanoic acid TFA salt The title compound is prepared in the same manner as in Example 2. Yield: 306 mg MS (SIMS): 523 [M+1] + HPLC retention time: 23.7 min. (Column: YMC-ODS 4.6 mmØ x 250 mm, Detection: UV 220 nm, Eluent; A solution; 0.1 % TFA/water, B solution; 0.1 % TFA/acetonitrile, Flow rate: 1 ml/min., Gradient: The concentration of the B solution is increased from 10 % at a rate of 1 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.23 (2H, m), 1.44 (3H, m), 1.77 (2H, m), 2.06 (2H, m), 2.14 (2H, t, J=6.6 Hz), 2.80 (2H, m), 3.05-3.45 (6H, m), 3.95 (1H, m), 7.72-7.85 (2H, m), 8.04 (4H, m), 8.17 (1H, m), 8.48 (1H, d, J=9.2 Hz), 8.48 (1H, m) Example 29 Synthesis of (2S)-3-(3-(3-(4-piperidyl)propanoylamino)propanoylamino)-2-(4-trifluoromethyl)benzenesulfonylaminopropanoic acid TFA salt The title compound is prepared in the same manner as in Example 2. Yield: 187 mg MS (SIMS): 523 [M+1] + HPLC retention time: 24.5 min. (Column: YMC-ODS 4.6 mmØ x 250 mm, Detection: UV 220 nm, Eluent; A solution; 0.1 % TFA/water, B solution; 0.1 % TFA/acetonitrile, Flow rate: 1 ml/min., Gradient: The concentration of the B solution is increased from 10 % at a rate of 1 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.22 (2H, m), 1.43 (3H, m), 1.76 (2H, m), 2.03-2.15 (4H, m), 2.80 (2H, m), 3.05-3.35 (6H, m), 3.95 (1H, m), 7.74 (1H, t, J=5.3 Hz), 7.96 (4H, s), 8.01 (1H, t, J=5.3 Hz), 8.15 (1H, m), 8.48 (1H, d, J=9.2 Hz), 8.48 (1H, m) Example 30 Synthesis of (2S)-2-(2-nitro)benzenesulfonylamino-3-(3-(3-(4-piperidyl)propanoylamino)propanoylamino)propanoic acid TFA salt The title compound is prepared in the same manner as in Example 2. Yield: 123 mg MS (SIMS): 500 [M+1] + HPLC retention time: 19.9 min. (Column: YMC-ODS 4.6 mmØ x 250 mm, Detection: UV 220 nm, Eluent; A solution; 0.1 % TFA/water, B solution; 0.1 % TFA/acetonitrile, Flow rate: 1 ml/min., Gradient: The concentration of the B solution is increased from 10 % at a rate of 1 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.20 (2H, m), 1.43 (3H, m), 1.76 (2H, m), 2.06 (2H, t, J=6.6 Hz), 2.17 (2H, t, J=7.6 Hz), 2.80 (2H, m), 3.10-3.50 (6H, m), 4.06 (1H, m), 7.74 (1H, t, J=5.3 Hz), 7.85 (2H, m), 7.92-8.07 (3H, m), 8.19 (1H, m), 8.39 (1H, m), 8.49 (1H, m) The chemical structures of the compounds obtained in Examples 24 to 30 are as follows. Example 31 Synthesis of (2S)-2-(3-nitro)benzenesulfonylamino-3-(3-(3-(4-piperidyl)propanoylamino)propanoylamino)propanoic acid TFA salt The title compound is prepared in the same manner as in Example 2. Yield: 199 mg MS (SIMS): 500 [M+1] + HPLC retention time: 18.4 min. (Column: YMC-ODS 4.6 mmØ x 250 mm, Detection: UV 220 nm, Eluent; A solution; 0.1 % TFA/water, B solution; 0.1 % TFA/acetonitrile, Flow rate: 1 ml/min., Gradient: The concentration of the B solution is increased from 10 % at a rate of 1 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.12-1.31 (2H, m), 1.37-1.53 (3H, m), 1.77 (2H, d, J=7 Hz), 2.06 (2H, t, J=7 Hz), 2.12 (2H, t, J=7 Hz), 2.70-2.90 (2H, m), 3.04-3.42 (6H, m), 3.90-4.01 (1H, m), 7.75 (1H, t, J=6 Hz), 7.87 (1H, t, J=8 Hz), 8.03 (1H, t, J=6 Hz), 8.13 (1H, d, J=7 Hz), 8.10-8.30 (1H, m), 8.40-8.66 (4H, m) Example 32 Synthesis of (2S)-2-(4-nitro)benzenesulfonylamino-3-(3-(3-(4-piperidyl)propanoylamino)propanoylamino)propanoic acid TFA salt The title compound is prepared in the same manner as in Example 2. Yield: 54 mg MS (SIMS): 500 [M+1] + HPLC retention time: 20.7 min. (Column: YMC-ODS 4.6 mmØ x 250 mm, Detection: UV 220 nm, Eluent; A solution; 0.1 % TFA/water, B solution; 0.1 % TFA/acetonitrile, Flow rate: 1 ml/min., Gradient: The concentration of the B solution is increased from 10 % at a rate of 1 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.21 (2H, m), 1.43 (3H, m), 1.77 (2H, m), 2.05 (2H, m), 2.13 (2H, m), 2.80 (2H, m), 3.05-3.43 (6H, m), 3.96 (1H, m), 7.74 (1H, t, J=5.3 Hz), 8.01 (3H, m), 8.17 (1H, m), 8.38 (2H, m), 8.50 (1H, m), 8.60 (1H, d, J=9.2 Hz) Example 33 Synthesis of (2S)-3-(3-(3-(4-piperidyl)propanoylamino)propanoylamino)-2-(2,4,6-trimethyl)benzenesulfonylaminopropanoic acid TFA salt The title compound is prepared in the same manner as in Example 2. Yield: 113 mg MS (SIMS): 497 [M+1] + HPLC retention time: 24.5 min. (Column: YMC-ODS 4.6 mmØ x 250 mm, Detection: UV 220 nm, Eluent; A solution; 0.1 % TFA/water, B solution; 0.1 % TFA/acetonitrile, Flow rate: 1 ml/min., Gradient: The concentration of the B solution is increased from 10 % at a rate of 1 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.23 (2H, m), 1.44 (3H, m), 1.76 (2H, m), 2.06 (4H, m), 2.24 (3H, s), 2.54 (6H, s), 2.80 (2H, m), 3.10-3.30 (6H, m), 3.80 (1H, m), 6.98 (2H, s), 7.73 (1H, t, J=5.6 Hz), 7.91 (2H, m), 8.18 (1H, m), 8.46 (1H, m) Example 34 Synthesis of (2S)-2-(2,3,4,5,6-pentafluoro)benzenesulfonylamino-3-(3-(3-(4-piperidyl)propanoylamino)propanoylamino)propanoic acid TFA salt The title compound is prepared in the same manner as in Example 2. Yield: 8.0 mg MS (SIMS): 545 [M+1] + HPLC retention time: 23.5 min. (Column: YMC-ODS 4.6 mmØ x 250 mm, Detection: UV 220 nm, Eluent; A solution; 0.1 % TFA/water, B solution; 0.1 % TFA/acetonitrile, Flow rate: 1 ml/min., Gradient: The concentration of the B solution is increased from 10 % at a rate of 1 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.21 (2H, m), 1.44 (3H, m), 1.77 (2H, m), 2.06 (2H, t, J=6.6 Hz), 2.19 (2H, m), 2.81 (2H, m), 3.10-3.40 (6H, m), 4.11 (1H, m), 7.76 (1H, t, J=5.6 Hz), 8.08 (1H, t, J=5.8 Hz), 8.10 (1H, m), 8.43 (1H, m), 9.23 (1H, d, J=9.2 Hz) Example 35 Synthesis of (2S)-2-(4-fluoro)benzenesulfonylamino-3-(3-(3-(4-piperidyl)propanoylamino)propanoylamino)propanoic acid TFA salt The title compound is prepared in the same manner as in Example 2. Yield: 141 mg MS (SIMS): 473 [M+1] + HPLC retention time: 19.1 min. (Column: YMC-ODS 4.6 mmØ x 250 mm, Detection: UV 220 nm, Eluent; A solution; 0.1 % TFA/water, B solution; 0.1 % TFA/acetonitrile, Flow rate: 1 ml/min., Gradient: The concentration of the B solution is increased from 10 % at a rate of 1 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.21 (2H, m), 1.44 (3H, m), 1.76 (2H, m), 2.06 (2H, t, J=7.6 Hz), 2.14 (2H, t, J=6.9 Hz), 2.80 (2H, m), 3.05-3.40 (6H, m), 3.88 (1H, m), 7.39 (2H, m), 7.84-7.75 (3H, m), 8.00 (1H, t, J=5.6 Hz), 8.21 (1H, d, J=9.2 Hz), 8.21 (1H, m), 8.51 (1H, m) Example 36 Synthesis of (2S)-2-(4-chloro)benzenesulfonylamino-3-(3-(3-(4-piperidyl)propanoylamino)propanoylamino)propanoic acid TFA salt The title compound is prepared in the same manner as in Example 2. Yield: 144 mg MS (SIMS): 489 [M+1] + HPLC retention time: 20.4 min. (Column: YMC-ODS 4.6 mmØ x 250 mm, Detection: UV 220 nm, Eluent; A solution; 0.1 % TFA/water, B solution; 0.1 % TFA/acetonitrile, Flow rate: 1 ml/min., Gradient: The concentration of the B solution is increased from 10 % at a rate of 1 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.13-1.33 (2H, m), 1.38-1.53 (3H, m), 1.77 (2H, d, J=14 Hz), 2.09 (2H, t, J=7 Hz), 2.14 (2H, t, J=7 Hz), 2.70-2.90 (2H, m), 3.02-3.50 (6H, m), 3.83-3.97 (1H, m), 7.63 (2H, d, J=8 Hz), 7.70-7.80 (3H, m), 8.00 (1H, bs), 8.22 (1H, bs), 8.29 (1H, d, J=9 Hz), 8.54 (1H, bs) Example 37 Synthesis of (2S)-2-(4-bromo)benzenesulfonylamino-3-(3-(3-(4-piperidyl)propanoylamino)propanoylamino)propanoic acid TFA salt The title compound is prepared in the same manner as in Example 2. Yield: 59 mg MS (SIMS): 535, 533 [M+1] + HPLC retention time: 23.5 min. (Column: YMC-ODS 4.6 mmØ x 250 mm, Detection: UV 220 nm, Eluent; A solution; 0.1 % TFA/water, B solution; 0.1 % TFA/acetonitrile, Flow rate: 1 ml/min., Gradient: The concentration of the B solution is increased from 10 % at a rate of 1 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.12-1.30 (2H, m), 1.37-1.52 (3H, m), 1.70-1.85 (2H, m), 2.06 (2H, t, J=7 Hz), 2.14 (2H, t, J=7 Hz), 2.70-2.90 (2H, m), 3.02-3.95 (7H, m), 7.68 (2H, d, J=9 Hz), 7.78 (2H, d, J=9 Hz), 7.70.7.80 (1H, m), 8.00 (1H, t, J=6 Hz); 8.19 (1H, bs), 8.29 (1H, d, J=9 Hz), 8.49 (1H, bs) The chemical structures of the compounds obtained in Examples 31 to 37 are as follows. Example 38 Synthesis of (2S)-2-(4-ethyl)benzenesulfonylamino-3-(3-(3-(4-piperidyl)propanoylamino)propanoylamino)propanoic acid TFA salt The title compound is prepared in the same manner as in Example 2. Yield: 152 mg MS (SIMS): 483 [M+1] + HPLC retention time: 22.3 min. (Column: YMC-ODS 4.6 mmØ x 250 mm, Detection: UV 220 nm, Eluent; A solution; 0.1 % TFA/water, B solution; 0.1 % TFA/acetonitrile, Flow rate: 1 ml/min., Gradient: The concentration of the B solution is increased from 10 %at arate of 1 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.19 (3H, t, J=7 Hz), 1.00-1.25 (2H, m), 1.36-1.52 (3H, m), 1.77 (2H, d, J=13 Hz), 2.00-2.20 (4H, m), 2.67 (2H, q, J=7 Hz), 2.74-2.90 (2H, m), 3.03-3.54 (6H, m), 3.80-3.92 (1H, m), 7.39 (2H, d, J=8 Hz), 7.67 (2H, d, J=8 Hz), 7.70-7.80 (1H, m), 7.91-7.99 (1H, m), 8.04 (1H, d, J=9 Hz), 8.15, 8.50 (2H, bs) Example 39 Synthesis of (2S)-2-(4-t-butyl)benzenesulfonylamino-3-(3-(3-(4-piperidyl)propanoylamino)propanoylamino)propanoic acid TFA salt The title compound is prepared in the same manner as in Example 2. Yield: 125 mg MS (SIMS): 511 [M+1] + HPLC retention time: 28.4 min. (Column: YMC-ODS 4.6 mmØ x 250 mm, Detection: UV 220 nm, Eluent; A solution; 0.1 % TFA/water, B solution; 0.1 % TFA/acetonitrile, Flow rate: 1 ml/min., Gradient: The concentration of the B solution is increased from 10 % at a rate of 1 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.22 (2H, m), 1.29 (9H, s), 1.43 (3H, m), 1.75 (2H, m), 2.05 (4H, m), 2.80 (2H, m), 3.00-3.40 (6H, m), 3.87 (1H, m), 7.56 (2H, d, J=8.6 Hz), 7.68 (2H, d, J=8.6 Hz), 7.74 (1H, t, J=5.6 Hz), 7.94 (1H, t, J=5.6 Hz), 8.04 (1H, d, J=8.9 Hz), 8,12 (1H, m), 8.47 (1H, m) Example 40 Synthesis of (2S)-2-(4-methoxy)benzenesulfonylamino-3-(3-(3-(4-piperidyl)propanoylamino)propanoylamino)propanoic acid TFA salt The title compound is prepared in the same manner as in Example 2. Yield: 74 mg MS (SIMS): 485 [M+1] + HPLC retention time: 17.3 min. (Column: YMC-ODS 4.6 mmØ x 250 mm, Detection: UV 220 nm, Eluent; A solution; 0.1 % TFA/water, B solution; 0.1 % TFA/acetonitrile, Flow rate: 1 ml/min., Gradient: The concentration of the B solution is increased from 10 % at a rate of 1 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.13-1.30 (2H, m), 1.36-1.53 (3H, m), 1.77 (2H, d, J=12 Hz), 2.06 (2H, t, J=7 Hz), 2.14 (2H, t, J=7 Hz), 2.70-2.90 (2H, m), 3.00-3.95 (7H, m), 3.82 (3H, s), 7.07 (2H, d, J=8 Hz), 7.69 (2H, d, J=8 Hz), 7.74 (1H, t, J=6 Hz), 7.95 (1H, d, J=9 Hz), 7.95-8.02 (1H, m), 8.17, 8.48 (2H, bs) Example 41 Synthesis of (2S)-2-(1-naphthalene)sulfonylamino-3-(3-(3-(4-piperidyl)propanoylamino)propanoylamino)propanoic acid TFA salt The title compound is prepared in the same manner as in Example 2. Yield: 154 mg MS (SIMS): 505 [M+1] + HPLC retention time: 12.4 min. (Column: YMC-ODS 4.6 mmØ x 250 mm, Detection: UV 220 nm, Eluent; A solution; 0.1 % TFA/water, B solution; 0.1 % TFA/acetonitrile, Flow rate: 1 ml/min., Gradient: The concentration of the B solution is increased from 10 % at a rate of 1 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.12-1.30 (2H, m), 1.36-1.53 (3H, m), 1.76 (2H, d, J=12 Hz), 1.90-2.10 (4H, m), 2.72-2.90 (2H, m), 3.00-3.70 (6H, m), 3.85-3.95 (1H, m), 7.58-7.77 (4H, m), 7.88 (1H, t, J=6 Hz), 8.00-8.25 (4H, m), 8.40-8.54 (2H, m), 8.64 (1H, d, J=8 Hz) Example 42 Synthesis of (2S)-2-(5-dimethylamino-1-naphthalene)sulfonylamino-3-(3-(3-(4-piperidyl)propanoylamino)propanoylamino)propanoic acid TFA salt The title compound is prepared in the same manner as in Example 2. Yield: 192 mg MS (SIMS): 548 [M+1] + HPLC retention time: 15.6 min. (Column: YMC-ODS 4.6 mmØ x 250 mm, Detection: UV 220 nm, Eluent; A solution; 0.1 % TFA/water, B solution; 0.1 % TFA/acetonitrile, Flow rate: 1 ml/min., Gradient: The concentration of the B solution is increased from 10 % at a rate of 1 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm):1.21 (2H, m), 1.42 (3H, m), 1.75 (2H, m), 1.90-2.06 (4H, m), 2.80 (2H, m), 2.82 (6H, s), 3.03-3.35 (6H, m), 3.80-4.00 (1H, m), 7.25 (1H, d, J=7.6 Hz), 7.59 (2H, m), 7.69 (1H, t, J=5.6 Hz), 7.85 (1H, t, J=5.6 Hz), 8.10 (1H, m), 8.20 (1H, m), 8.28 (1H, d, J=8.6 Hz), 8.42 (2H, t, J=9.6 Hz), 8.45 (1H, m) Example 43 Synthesis of (2S)-2-(2-naphthalene)sulfonylamino-3-(3-(3-(4-piperidyl)propanoylamino)propanoylamino)propanoic acid TFA salt The title compound is prepared in the same manner as in Example 2. Yield: 159 mg MS (SIMS): 505 [M+1] + HPLC retention time: 13.8 min. (Column: YMC-ODS 4.6 mmØ x 250 mm, Detection: UV 220 nm, Eluent; A solution; 0.1 % TFA/water, B solution; 0.1 % TFA/acetonitrile, Flow rate: 1 ml/min., Gradient: The concentration of the B solution is increased from 10 % at a rate of 1 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.11-1.30 (2H, m), 1.35-1.51 (3H, m), 1.76 (2H, d, J=12 Hz), 2.00-2.16 (4H, m), 2.70-2.90 (2H, m), 3.05-3.55 (6H, m), 3.89-4.00 (1H, m), 7.60-7.85 (4H, m), 7.95-8.60 (8H, m) Example 44 Synthesis of (2S)-2-ethanesulfonylamino-3-(3-(3-(4-piperidyl)propanoylamino)propanoylamino)propanoic acid TFA salt The title compound is prepared in the same manner as in Example 2. Yield: 82 mg MS (SIMS): 407 [M+1] + HPLC retention time: 12.1 min. (Column: YMC-ODS 4.6 mmØ x 250 mm, Detection: UV 220 nm, Eluent; A solution; 0.1 % TFA/water, B solution; 0.1 % TFA/acetonitrile, Flow rate: 1 ml/min., Gradient: The concentration of the B solution is increased from 10 % at a rate of 1 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.20 (5H, m), 1.36-1.55 (3H, m), 1.77 (2H, d, J=14 Hz), 2.06 (2H, t, J=7 Hz), 2.23 (2H, t, J=7 Hz), 2.81 (2H, q, J=12 Hz), 2.97 (2H, q, J=7 Hz), 3.10-3.60 (6H, m), 3.90-4.04 (1H, m), 7.53 (1H, d, J=9 Hz), 7.76 (1H, t, J=6 Hz), 8.03 (1H, t, J=6 Hz), 8.20, 8.49 (2H, bs) The chemical structures of the compounds obtained in Examples 38 to 44 are as follows. Example 45 Synthesis of (2S)-3-(3-(3-(4-piperidyl)propanoylamino)propanoylamino)-2-propanesulfonylaminopropanoic acid TFA salt The title compound is prepared in the same manner as in Example 2. Yield: 54 mg MS (SIMS): 421 [M+1] + HPLC retention time: 8.88 min. (Column: YMC-ODS 4.6 mmØ x 250 mm, Detection: UV 220 nm, Eluent; A solution; 0.1 % TFA/water, B solution; 0.1 % TFA/acetonitrile, Flow rate: 1 ml/min., Gradient: The concentration of the B solution is increased from 10 % at a rate of 1 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm): 0.94 (3H, t, J=7 Hz), 1.10-1.35 (2H, m), 1.36-1.55 (3H, m), 1.60-1.85 (4H, m), 1.95-2.10 (2H, m), 2.18-2.30 (2H, m), 2.80-3.75 (10H, m), 3.90-4.02 (1H, m), 7.53 (1H, d, J=9 Hz), 7.72 (1H, m), 8.00-8.08 (1H, m), 8.10-8.65 (2H, m), Example 46 Synthesis of (2S)-2-(4-methoxy-2,3,6-trimethyl)benzenesulfonylamino-3-(3-(3-(4-piperidyl)propanoylamino)propanoylamino)propanoic acid TFA salt The title compound is prepared in the same manner as in Example 2. Yield: 219 mg MS (SIMS): 527 [M+1] + HPLC retention time: 24.5 min. (Column: YMC-ODS 4.6 mmØ x 250 mm, Detection: UV 220 nm, Eluent; A solution; 0.1 % TFA/water, B solution; 0.1 % TFA/acetonitrile, Flow rate: 1 ml/min., Gradient: The concentration of the B solution is increased from 10 % at a rate of 1 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.10-1.32 (2H, m), 1.39-1.53 (3H, m), 1.77 (2H, d, J=13 Hz), 2.07 (3H, s), 1.98-2.18 (4H, m), 2.51 (3H, s), 2.56 (3H, s), 2.71-2.90 (2H, m), 3.05-4.00 (7H, m), 3.81 (3H, s), 6.76 (1H, s), 7.70-7.76 (1H, m), 7.80 (1H, d, J=10 Hz), 7.90-7.98 (1H, m), 8.19 (1H, bs), 8.47 (1H, m) Example 47 Synthesis of (2S)-3-(3-(3-(4-piperidyl)propanoylamino)propanoylamino)-2-(4-trifluoromethoxy)benzenesulfonylaminopropanoic acid TFA salt The title compound is prepared in the same manner as in Example 2. Yield: 216 mg MS (SIMS): 539 [M+1] + HPLC retention time: 25.6 min. (Column: YMC-ODS 4.6 mmØ x 250 mm, Detection: UV 220 nm, Eluent; A solution; 0.1 % TFA/water, B solution; 0.1 % TFA/acetonitrile, Flow rate: 1 ml/min., Gradient: The concentration of the B solution is increased from 10 % at a rate of 1 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.12-1.31 (2H, m), 1.38-1.53 (3H, m), 1.76 (2H, d, J=13 Hz), 2.00-2.20 (4H, m), 2.72-2.90 (2H, m), 3.05-3.75 (6H, m), 3.88-4.00 (1H, m), 7.56 (2H, d, J=9 Hz), 7.75 (1H, t, J=6 Hz), 7.89 (2H, d, J=9 Hz), 7.90 (1H, t, J=6 Hz), 8.20 (1H, bs), 8.34 (1H, d, J=9 Hz), 8.52 (1H, bs) Example 48 Synthesis of (2S)-2-(4-butoxy)benzenesulfonylamino-3-(3-(3-(4-piperidyl)propanoylamino)propanoylamino)propanoic acid TFA salt The title compound is prepared in the same manner as in Example 2. Yield: 143 mg MS (SIMS): 527 [M+1] + HPLC retention time: 29.7 min. (Column: YMC-ODS 4.6 mmØ x 250 mm, Detection: UV 220 nm, Eluent; A solution; 0.1 % TFA/water, B solution; 0.1 % TFA/acetonitrile, Flow rate: 1 ml/min., Gradient: The concentration of the B solution is increased from 10 % at a rate of 1 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm): 0.94 (3H, t, J=7 Hz), 1.12-1.31 (2H, m), 1.38-1.54 (5H, m), 1.64-1.83 (4H, m), 2.06 (2H, d, J=7 Hz), 2.15 (2H, t, J=7 Hz), 2.73-2.90 (2H, m), 3.03-3.60 (6H, m), 3.79-3.88 (1H, m), 4.03 (2H, t, J=7 Hz), 7.06 (2H, d, J=9 Hz), 7.67 (2H, d, J=9 Hz), 7.74 (1H, t, J=6 Hz), 7.93 (1H, d, J=9 Hz), 7.97 (1H, t, J=6 Hz), 8.17 (1H, bs), 8.46 (1H, bs) Example 49 Synthesis of (2S)-3-(3-(3-(4-piperidyl)propanoylamino)propanoylamino)-2-(4-propyl)benzenesulfonylaminopropanoic acid TFA salt The title compound is prepared in the same manner as in Example 2. Yield: 146 mg MS (SIMS): 497 [M+1] + HPLC retention time: 26.4 min. (Column: YMC-ODS 4.6 mmØ x 250 mm, Detection: UV 220 nm, Eluent; A solution; 0.1 % TFA/water, B solution; 0.1 % TFA/acetonitrile, Flow rate: 1 ml/min., Gradient: The concentration of the B solution is increased from 10 % at a rate of 1 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm): 0.88 (3H, t, J=7 Hz), 1.12-1.32 (2H, m), 1.35-1.51 (3H, m), 1.55-1.69 (2H, m), 1.70-1.85 (2H, m), 2.00-2.20 (4H, m), 2.56-2.70 (2H, m), 2.72-2.80 (2H, m), 3.00-3.95 (7H, m), 7.37 (2H, d, J=8 Hz), 7.66 (2H, d, J=8 Hz), 7.72-7.80 (1H, m), 7.91-8.10 (2H, m), 8.10-8.76 (2H, m) Example 50 Synthesis of (2S)-2-(4-isopropyl)benzenesulfonylamino-3-(3-(3-(4-piperidyl)propanoylamino)propanoylamino)propanoic acid TFA salt The title compound is prepared in the same manner as Example 2. Yield: 226 mg MS (SIMS): 497 [M+1] + HPLC retention time: 25.8 min. (Column: YMC-ODS 4.6 mmØ x 250 mm, Detection: UV 220 nm, Eluent; A solution; 0.1 % TFA/water, B solution; 0.1 % TFA/acetonitrile, Flow rate: 1 ml/min., Gradient: The concentration of the B solution is increased from 10 % at a rate of 1 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.21 (6H, d, J=7 Hz), 1.05-1.25 (2H, m), 1.38-1.54 (3H, m), 1.77 (2H, d, J=14 Hz), 2.00-2.20 (4H, m), 2.72-2.90 (2H, m), 2.91-3.90 (8H, m), 7.42 (2H, d, J=8 Hz), 7.68 (2H, d, J=8 Hz), 7.74 (1H, bs), 7.95 (1H, bs), 8.26 (1H, d, J=9 Hz), 8.20, 8.52 (2H, bs) Example 51 Synthesis of (2S)-2-benzenesulfonylamino-3-(3-(3-(4-piperidyl)propanoylamino)propanoylamino)propanoic acid ethyl ester (2S)-2-Benzenesulfonylamino-3-(3-(3-(1-t-butoxycarbonyl-4-piperidyl)propanoylamino)propanoylamino)propanoic acid ethyl ester (462 mg), which is prepared in the same manner as in the synthesis of the compound of Example 2-(6), is dissolved in a mixture of TFA (10 ml) and anisole (1 ml) under ice-cooling, and the mixture is stirred for 30 minutes. The reaction mixture is concentrated under reduced pressure, and the residue is dissolved in water. The mixture is washed with ether, and the aqueous layer is concentrated under reduced pressure. The residue is purified by HPLC to give the title compound (227 mg) as a colorless powder. MS (SIMS): 483 [M+1] + HPLC retention time: 22.1 min. (Column: YMC-ODS 4.6 mmØ x 250 mm, Detection: UV 220 nm, Eluent; A solution; 0.1 % TFA/water, B solution; 0.1 % TFA/acetonitrile, Flow rate: 1 ml/min., Gradient: The concentration of the B solution is increased from 10 % at a rate of 1 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm): 0.99 (3H, t, J=7 Hz),1.11-1.30 (2H, m), 1.36-1.50 (3H, m), 1.77 (2H, d, J=14 Hz), 2.08 (2H, t, J=7 Hz), 2.14 (2H, t, J=7 Hz), 2.72-2.90 (2H, m), 3.05-3.50 (6H, m), 3.78 (2H, q, J=7 Hz), 3.90-4.00 (1H, m), 7.52-7.68 (3H, m), 7.71-7.80 (3H, m), 7.98-8.55 (4H, m) Example 52 Synthesis of (2S)-2-benzenesulfonylamino-3-(3-(3-(4-piperidyl)propanoylamino)propanoylamino)propanoic acid (5-indanyl) ester The title compound is prepared in the same manner as Example 51. Yield: 239 mg MS (SIMS): 571 [M+1] + HPLC retention time: 35.1 min. (Column: YMC-ODS 4.6 mmØ x 250 mm, Detection: UV 220 nm, Eluent; A solution; 0.1 % TFA/water, B solution; 0.1 % TFA/acetonitrile, Flow rate: 1 ml/min., Gradient: The concentration of the B solution is increased from 10 % at a rate of 1 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.10-1.30 (2H, m), 1.35-1.50 (3H, m), 1.68-1.80 (2H, m), 1.90-2.10 (4H, m), 2.15-2.25 (2H, m), 2.70-2.90 (6H, m), 3.10-3.30 (6H, m), 4.13-4.25 (1H, m), 6.52-6.65 (2H, m), 7.16 (1H, d, J=8 Hz), 7.55-7.90 (6H, m), 8.10-8.30 (2H, m), 8.40-8.65 (2H, m) The chemical structures of the compounds obtained in Examples 45 to 52 are as follows. Example 53 Synthesis of (2S)-2-benzenesulfonylamino-3-(3-(4-(4-piperidyl)butanoylamino)propanoylamino)propanoic acid TFA salt (1) (2S)-2-Benzyloxycarbonylamino-3-(3-(4-(1 -t-butoxycarbonyl-4-piperidyl)butanoyl)aminopropanoyl)aminopropanoic acid ethyl ester (2S)-2-Benzyloxycarbonylamino-3-(3-t-butoxycarbonylaminopropanoyl)aminopropanoic acid ethyl ester (500 mg), which is prepared in the same manner as in the synthesis of the compound of Example 1-(4), is dissolved in acetonitrile (5 ml), and thereto is added dropwise methanesulfonic acid (371 µl) under ice-cooling, and the mixture is stirred for 1.5 hour. To the mixture are added successively DMF (5 ml) and triethylamine (637 µl) under ice-cooling, and to the mixture are added the compound (335 mg) obtained in Example 5-(1), HOBT·H 2 O (170 mg), and further thereto are added WSC.HCI (241 mg), and triethylamine (159 µl), and the mixture is stirred at room temperature for 20 hours. The mixture is poured into water, and extracted three times with ethyl acetate. The organic layer is washed successively with a saturated aqueous sodium hydrogen carbonate solution (twice) and a saturated brine (twice), and dried over anhydrous magnesium sulfate. The desiccant is removed by filtration, and the filtrate is concentrated under reduced pressure to give the title compound (738 mg). (2) (2S)-2-Benzenesulfonylamino-3-(3-(4-(1-t-butoxycarbonyl-4-piperidyl)butanoyl)aminopropanoyl)aminopropanoic acid ethyl ester The compound (738 mg) obtained in the above (1) is dissolved in ethanol (20 ml) and thereto is added 10 % palladium-carbon (50 % wet, 300 mg), and the mixture is stirred at room temperature for two hours under hydrogen atmosphere. The insoluble materials are removed by filtration, and the filtrate is concentrated under reduced pressure to give an amine compound (597 mg). The amine compound (339 mg) is dissolved in dichloromethane (10 ml), and thereto are added benzenesulfonyl chloride (146 mg) and triethylamine (250 µl), and the mixture is stirred for one hour. The mixture is evaporated under reduced pressure to remove the solvent, and to the residue is added ethyl acetate. The mixture is washed successively with 1N hydrochloric acid (twice), a saturated brine (once), a saturated aqueous sodium hydrogen carbonate solution (twice), and a saturated brine (twice), and dried over anhydrous magnesium sulfate. The desiccant is removed by filtration, and the filtrate is concentrated under reduced pressure. The residue is purified by silica gel column chromatography (silica gel; 30 g, solvent; chloroform/methanol = 20:1). The fractions containing the title compound are concentrated under reduced pressure to give the title compound (483 mg). (3) (2S)-3-(3-(4-(4-Piperidyl)butanoyl)aminopropanoyl)amino-2-benzenesulfonylaminopropanoic acid TFA salt The compound (40 mg) obtained in the above (2) is dissolved in ethanol (5 ml) and thereto is added an aqueous solution of lithium hydroxide (LiOH; 195 mg, water; 5 ml), and the mixture is stirred at room temperature for 12 hours. The mixture is evaporated under reduced pressure to remove the solvent, and the pH value of the residue is adjusted to pH 2 with 10 % citric acid, and extracted three times with ethyl acetate. The extract is washed twice with a saturated brine, and dried over anhydrous magnesium sulfate. The desiccant is removed by filtration, and the filtrate is concentrated under reduced pressure. The residue is dissolved in TFA (10 ml) under ice-cooling, and the mixture is stirred for 30 minutes. The reaction mixture is concentrated under reduced pressure, and the residue is purified by HPLC to give a white powder (277 mg). MS (SIMS): 469 [M+1] + HPLC retention time: 19.8 min. (Column: YMC-ODS 4.6 mmØ x 250 mm, Detection: UV 220 nm, Eluent; A solution; 0.1 % TFA/water, B solution; 0.1 % TFA/acetonitrile, Flow rate: 1 ml/min., Gradient: The concentration of the B solution is increased from 10 % at a rate of 1 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.17 (4H, m), 1.47 (3H, m), 1.76 (2H, m), 2.02 (2H, t, J=7.6 Hz), 2.11 (2H, m), 2.80 (2H, m), 3.00-3.35 (6H, m), 3.88 (1H, m), 7.57 (3H, m), 7.69 (1H, t, J=5.9 Hz), 7.76 (2H, m), 7.96 (1H, t, J=6.3 Hz), 8.14 (1H, d, J=8.9 Hz), 8.14 (1H, m), 8.43 (1H, m) Example 54 Synthesis of (2S)-2-benzenesulfonylamino-3-(4-(4-piperidylmethylcarbamoyl)butanoylamino)propanoic acid TFA salt (1) (1-t-Butoxycarbonyl-4-piperidyl)methylamine 4-Piperidylmethylamine (1.0 g) is dissolved in DMF (20 ml), and thereto are added 18-crown-6 (3.47 g), p-toluenesulfonic acid monohydrate (3.66 g) and triethylamine (1.46 ml) under ice-cooling, and the mixture is stirred for two hours. To the mixture is added di-t-butyl dicarbonate (2.29 g), and the mixture is further stirred for two hours. The mixture is evaporated under reduced pressure to remove the solvent, and 10 % aqueous citric acid solution is added to the residue. The mixture is washed twice with ether, and the aqueous layer is basified with sodium hydrogen carbonate. The mixture is extracted three times with ethyl acetate, and the organic layer is dried over anhydrous sodium sulfate. The desiccant is removed by filtration, and the filtrate is concentrated under reduced pressure to give the title compound (1.46 g). (2) 4-(1-t-Butoxycarbonyl-4-piperidy)methylcarbamoylbutanoic acid The compound (1.46 g) obtained in the above (1) is dissolved in dichloromethane (20 ml), and thereto are added glutaric anhydride (0.86 g) and triethylamine (1.14 ml), and the mixture is stirred for two hours. To the mixture is added dropwise N-(3-aminopropyl)morpholine (0.3 ml), and the mixture is further stirred for 30 minutes. The mixture is evaporated under reduced pressure to remove the solvent, and thereto is added 10 % aqueous citric acid solution, and extracted with ethyl acetate. The organic layer is dried over anhydrous magnesium sulfate, and the desiccant is removed by filtration, and the filtrate is concentrated under reduced pressure to give the title compound (1.54 g). (3) (2S)-2-Amino-3-t-butoxycarbonylaminopropanoic acid ethyl ester (2S)-2-Benzyloxycarbonylamino-3-t-butoxycarbonylaminopropanoic acid ethyl ester (3.0 g), which is prepared in the same manner as the synthesis of the compound of Example 1-(3), is dissolved in a mixture of ethyl acetate (10 ml) and ethanol (15 ml), and thereto is 10 % palladium-carbon (50 % wet, 1.5 g), and the mixture is stirred at room temperature for 4.5 hours under hydrogen atmosphere. The insoluble materials are removed by filtration, and the filtrate is concentrated under reduced pressure to give the title compound (1.84 g) as an oily product. (4) (2S)-2-Benzenesulfonylamino-3-t-butoxycarbonylaminopropanoic acid ethyl ester The compound obtained in the above (3) is dissolved in dichloromethane (15 ml), and thereto are added triethylamine (2.0 ml) and benzenesulfonyl chloride (1.57 ml) at room temperature, and the mixture is stirred for 30 minutes. To the mixture are further added triethylamine (0.57 ml) and benzenesulfonyl chloride (0.52 ml), and the mixture is further stirred for 30 minutes. The reaction mixture is poured into water, and the mixture is extracted three times with ethyl acetate. The extract is washed successively with 1N hydrochloric acid (twice), a saturated brine (once), a saturated aqueous sodium hydrogen carbonate solution (twice) and a saturated brine (twice), and dried over anhydrous magnesium sulfate. The desiccant is removed by filtration, and the filtrate is concentrated under reduced pressure. The residue is purified by silica gel column chromatography (silica gel; 100 g, solvent; hexane/ethyl acetate = 1:1). The fractions containing the title compound are concentrated under reduced pressure to give the title compound (2.69 g) as a colorless powder. (5) (2S)-2-Benzenesulfonylamino-3-(4-((1-t-butoxycarbonyl-4-piperidyl)methylcarbamoyl)butanoylamino)propanoic acid ethyl ester The compound (100 mg) obtained in the above (4) is dissolved in acetonitrile (3 ml) and thereto is added dropwise methanesulfonic acid (87 µl) under ice-cooling, and the mixture is stirred for one hour. To the mixture are added successively DMF (3 ml), triethylamine (150 µl), the compound (100 mg) obtained in the above (2), HOBT·H 2 O (40 mg) and WSC·HCl (60 mg) under ice-cooling, and further thereto is added dropwise triethylamine (37 µl), and the mixture is stirred at room temperature for 20 hours. The reaction mixture is poured into water, and the mixture is extracted three times with ethyl acetate. The organic layer is washed successively with a saturated aqueous sodium hydrogen carbonate solution (twice), 10 % aqueous citric acid solution (twice), and a saturated brine (twice), and dried over anhydrous magnesium sulfate. The desiccant is removed by filtration, and the filtrate is concentrated under reduced pressure to give the title compound (160 mg). (6) (2S)-2-Benzenesulfonylamino-3-(4-(4-piperidylmethylcarbamoyl)butanoylamino)propanoic acid TFA salt The compound (160 mg) obtained in the above (5) is dissolved in ethanol (3 ml) and thereto is added an aqueous solution of lithium hydroxide (LiOH; 60 mg, water; 3 ml), and the mixture is stirred at room temperature for 3 hours. The mixture is evaporated under reduced pressure to remove the solvent, and the pH value of the residue is adjusted to pH 2 with 10 % aqueous citric acid solution, and extracted three times with ethyl acetate. The extract is washed twice with a saturated brine, and dried over anhydrous magnesium sulfate. The desiccant is removed by filtration, and the filtrate is concentrated under reduced pressure. The residue is dissolved in TFA (5 ml) under ice-cooling, and the mixture is stirred for 40 minutes. The reaction mixture is concentrated under reduced pressure, and the residue is purified by HPLC to give a white powder (126 mg). MS (SIMS): 455 [M+1] + HPLC retention time: 14.7 min. (Column: YMC-ODS 4.6 mmØ x 250 mm, Detection: UV 220 nm, Eluent; A solution; 0.1 % TFA/water, B solution; 0.1 % TFA/acetonitrile, Flow rate: 1 ml/min., Gradient: The concentration of the B solution is increased from 10 % at a rate of 1 %/min. ) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.25 (2H, m), 1.58-1.76 (5H, m), 1.92-2.06 (4H, m), 2.81 (2H, m), 2.95 (2H, t, J=6.3 Hz), 3.07 (1H, m), 3.27 (3H, m), 3.86 (1H, m), 7.57 (3H, m), 7.75 (2H, m), 7.85 (2H, m), 8.13 (1H, d, J=8.9 Hz), 8.15 (1H, m), 8.49 (1H, m) Example 55 Synthesis of (25)-2-benzenesulfonylamino-3-(3-(2-(4-piperidyloxy)ethanoylamino)propanoylamino)propanoic acid TFA salt (1) 2-(1-Benzyloxycarbonyl-4-piperidyl)oxyacetic acid t-Butyl 2-(1-benzyloxycarbonyl-4-piperidyl)oxyacetate (11.0 g), which is prepared by the method disclosed in J. Med. Chem., 35 , 4393 (1992), is stirred in 4N hydrogen chloride/dioxane at room temperature for four hours, and the mixture is evaporated under reduced pressure to remove the solvent to give the title compound (9.2 g) as a pale yellow oil. 1 H-NMR (CDCl 3 ) δ (ppm): 1.52-1.70 (2H, m), 1.78-1.96 (2H, m), 3.15-3.28 (2H, m), 3.56-3.68 (1H, m), 3.74-3.92 (2H, m), 4.17 (2H, s), 5.15 (2H, s), 7.28-7.42 (5H, m) (2) (2S)-2-Benzenesulfonylamino-3-(3-(2-(1-benzyloxycarbonyl-4-piperidyl)oxyethanoylamino)propanoylamino)propanoic acid ethyl ester (2S)-2-Benzenesulfonylamino-3-(3-(t-butoxycarbonylamino)propanoylamino)propanoic acid ethyl ester (100 mg), which is prepared in the same manner as the synthesis of the compound of Example 1-(5), is subjected to de-t-butoxycarbonylation in the same manner as in Example 1-(8), and the resulting compound is condensed with the compound (73 mg) obtained in the above (1) to give the title compound (144 mg). (3) (2S)-2-Benzenesulfonylamino-3-(3-(2-(1-benzyloxycarbonyl-4-piperidyl)oxyethanoylamino)propanoylamino)propanoic acid The compound (144 mg) obtained in the above (2) is dissolved in DMF (3 ml), and thereto is added 1N aqueous sodium hydroxide solution (698 µl) under ice-cooling, and the mixture is stirred for 1.5 hour. The pH value thereof is adjusted to pH 2 with 10 % aqueous citric acid solution, and extracted three times with ethyl acetate. The extract is washed twice with a saturated brine, and dried over anhydrous magnesium sulfate. The desiccant is removed by filtration, and the filtrate is concentrated under reduced pressure to give the title compound (92 mg). (4) (2S)-2-Benzenesulfonylamino-3-(3-(2-(4-piperidyl)oxyethanoylamino)propanoylamino)propanoic acid TFA salt The compound (92 mg) obtained in the above (3) is dissolved in methanol (20 ml), and thereto are added acetic acid (100 µl) and 10 % palladium-carbon (50 % wet, 100 mg), and the mixture is stirred at room temperature for three hours under hydrogen atmosphere. The insoluble materials are removed by filtration, and the filtrate is evaporated under reduced pressure to remove the solvent. The residue is purified by HPLC to give a white powder (31 mg). MS (SIMS): 483 [M+1] + HPLC retention time: 14.8 min. (Column: YMC-ODS 4.6 mmØ x 250 mm, Detection: UV 220 nm, Eluent; A solution; 0.1 % TFA/water, B solution; 0.1 % TFA/acetonitrile, Flow rate: 1 ml/min., Gradient: The concentration of the B solution is increased from 10 % at a rate of 1 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.65-1.80 (2H, m), 1.85-2.00 (2H, m), 2.10-2.25 (2H, m), 2.90-3.40 (7H, m), 3.45-4.20 (5H, m), 7.50-7.65 (3H, m), 7.70-7.80 (3H, m), 7.98-8.16 (1H, m), 8.15 (1H, d, J=9 Hz), 8.46 (2H, s) The chemical structures of the compounds obtained in Examples 53 to 55 are as follows. Example 53 Example 54 Example 55 Example 56 Synthesis of (2S)-3-(4-(4-amidinophenoxy)butanoylamino)-2-butanesulfonylaminopropanoic acid TFA salt (1) 4-(4-Cyanophenoxy)butanoic acid ethyl ester 4-Cyanophenol (5.0 g) is dissolved in DMF (6 ml), and thereto are added ethyl 4-bromobutanate (7.94 ml) and potassium carbonate (6.4 g), and the mixture is stirred at room temperature for 74 hours. The reaction mixture is poured into water, and the colorless precipitates are collected by filtration and washed with water to give the title compound (9.5 g). 1 H-NMR (CDCl 6 ) δ (ppm): 1.26 (3H, t, J=7 Hz), 2.05-2.25 (2H, m), 2.52 (2H, t, J=7 Hz), 4.07 (2H, t, J=6.3 Hz), 4.15 (2H, q, J=7 Hz), 6.94 (2H, d, J=9.2 Hz), 7.58 (2H, d, J=9.2 Hz) (2) 4-(4-Amidinophenoxy)butanoic acid ethyl ester hydroiodide The compound (3 g) obtained in the above (1) is dissolved in a mixture of pyridine (75 ml) and triethylamine (15 ml), and thereto is blown hydrogen sulfide gas for 30 minutes under ice-cooling. To the mixture is further blown hydrogen sulfide gas for three hours at room temperature, and the mixture is stirred for 20 hours. The hydrogen sulfide is removed by blowing nitrogen gas into the mixture, and the mixture is concentrated under reduced pressure. The residue is dissolved in acetone (60 ml) and thereto is added methyl iodide (5 ml), and the mixture is heated with stirring at 50°C for 30 minutes. After cooling, the mixture is concentrated under reduced pressure, and the residue is dissolved in methanol (100 ml) and thereto is added ammonium acetate (2.05 g). The mixture is heated with stirring at 70°C for 3.5 hours. After cooling, nitrogen gas is blown into the mixture, and the mixture is concentrated under reduced pressure. Ether is added to the residue, and the precipitates are collected by filtration to give the title compound (2.74 g). MS (SIMS): 251 [M+1] + 1 H-NMR (CD 3 OD) δ (ppm): 1.16 (3H, t, J=7 Hz), 1.95-2.1 (2H, m), 2.45 (2H, t, J=7.3 Hz), 4.0-4.15 (4H, m), 7.05 (2H, d, J=9.2 Hz), 7.71 (2H, d, J=9.2 Hz) (3) 4-(4-Amidinophenoxy)butanoic acid The compound (500 mg) obtained in the above (2) is dissolved in a mixture of 1N hydrochloric acid (5 ml) and acetic acid (5 ml), and the mixture is stirred at 50°C for 8 hours. The reaction mixture is concentrated under reduced pressure, and the residue is dried to give the title compound (388 mg) as a brown solid. MS (SIMS): 323 [M+1] + 1 H-NMR (CD 3 OD) δ (ppm): 1.95-2.1 (2H, m), 2.43 (2H, t, J=7.3 Hz), 4.08 (2H, t, J=6.3 Hz), 7.06 (2H, d, J=9 Hz), 7.71 (2H, d, J=9 Hz) (4) (2S)-2-Butanesulfonylamino-3-t-butoxycarbonylaminopropanoic acid ethyl ester The title compound is prepared from the compound (350 mg) obtained in Example 54-(3) by using butanesulfonyl chloride in the same manner as in Example 54-(4). Yield: 438 mg 1 H-NMR (CDCl 3 ) δ (ppm): 0.94 (3H, t, J=7 Hz), 1.31 (3H, t, J=7 Hz), 1.44 (9H, s), 1.35-1.55 (2H, m), 1.7-1.9 (2H, m), 2.95-3.1 (2H, m), 3.4-3.65 (2H, m), 4.1-4.35 (3H, m), 4.94 (1H, bs), 5.42 (1H, bd, J=8.3 Hz) (5) (2S)-3-(4-(4-Amidinophenoxy)butanoylamino)-2-butanesulfonylaminopropanoic acid TFA salt The compound (151 mg) obtained in the above (4) is dissolved in acetonitrile (1.5 ml) and thereto is added a solution of methanesulfonic acid (206 mg) in acetonitrile (0.8 ml) under ice-cooling, and the mixture is stirred at room temperature for 30 minutes. To the reaction mixture are added successively DMF (2 ml), triethylamine (300 µl), the compound (133 mg) obtained in the above (3), HOBT·H 2 O (80 mg) and WSC·HCl (100 mg) under ice-cooling, and the mixture is stirred at room temperature for 22 hours. The reaction mixture is concentrated under reduced pressure. The residue is washed with ether, and thereto is added a mixture of 1N hydrochloric acid (10 ml) and acetic acid (10 ml), and the mixture is stirred at 60°C for 16 hours. The reaction mixture is concentrated under reduced pressure, and the residue is purified by HPLC to give the title compound (92 mg) as a colorless powder. MS (SIMS): 429 [M+1] + HPLC retention time: 20.1 min. (Column: YMC-ODS 4.6 mmØ x 250 mm, Detection: UV 220 nm, Eluent; A solution; 0.1 % TFA/water, B solution; 0.1 % TFA/acetonitrile, Flow rate: 1 ml/min., Gradient: The concentration of the B solution is increased from 10 % at a rate of 1 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm): 0.87 (3H, t, J=7.3 Hz), 1.30-1.50 (2H, m), 1.55-1.80 (2H, m), 1.90-2.10 (2H, m), 2.25 (2H, t, J=8 Hz), 2.90-3.05 (2H, m), 3.10-3.30 (1H, m), 3.35-3.50 (1H, m), 3.90-4.05 (1H, m), 4.08 (2H, t, J=6.6 Hz), 7.15 (2H, d, J=8.9 Hz), 7.54 (1H, d, J=8.9 Hz), 7,80 (2H, d, J=8.9 Hz), 8.05 (1H, bt, J=6 Hz), 8.82 (2H, bs), 9.12 (2H, bs) Example 57 Synthesis of (2S)-3-(4-(4-amidinophenoxy)butanoylamino)-2-(4-methoxy)benzenesulfonylaminopropanoic acid TFA salt (1) (2S)-3-t-Butoxycarbonylamino-2-(4-methoxy)benzenesulfonylaminopropanoic acid ethyl ester The title compound is prepared from the compound (300 mg) obtained in Example 54-(3) by using 4-methoxybenzenesulfonyl chloride in the same manner as in Example 54-(4). Yield: 500 mg 1 H-NMR (CDCl 3 ) δ (ppm): 1.15 (3H, t), 1.42 (9H, s), 3.46 (2H, m), 3.86 (3H, s), 3.85.4.10 (1H, m), 4.02 (2H, q, J=7 Hz), 4.92 (1H, bs), 5.49 (1H, bd, J=7.6 Hz), 6.96 (2H, d, J=8.9 Hz), 7.77 (2H, d, J=8.9 Hz) (2) (2S)-3-(4-Amidinophenoxy)butanoylamino)-2-(4-methoxy)benzenesulfonylaminopropanoic acid TFA salt The title compound is prepared from the compound (133 mg) obtained in Example 56-(3) and the compound (172 mg) obtained in the above (1) in the same manner as in Example 56-(5). Yield: 100 mg MS (SIMS): 479 [M+1] + HPLC retention time: 22.3 min. (Column: YMC-ODS 4.6 mmØ x 250 mm, Detection: UV 220 nm, Eluent; A solution; 0.1 % TFA/water, B solution; 0.1 % TFA/acetonitrile, Flow rate: 1 ml/min., Gradient: The concentration of the B solution is increased from 10 % at a rate of 1 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.80-2.00 (2H, m), 2.10-2.25 (2H, m), 3.00-3.20 (1H, m), 3.25-3.40 (1H, m), 3.80-3.95 (1H, m), 3.81 (3H, s), 4.05 (2H, t, J=6 Hz), 7.06 (2H, d, J=9 Hz), 7.14 (2H, d, J=8.9 Hz), 7.69 (2H, d, J=9 Hz), 7.80 (2H, d, J=8.9 Hz), 7.90-8.10 (2H, m), 8.87 (2H, bs), 9.13 (2H, bs) Example 58 Synthesis of (2S)-3-(4-(4-amidinophenoxy)butanoylamino)-2-benzenesulfonylaminopropanoic acid TFA salt The title compound is prepared in the same manner as in Example 57. Yield: 47 mg MS (SIMS): 449 [M+1] + HPLC retention time: 16.6 min. (Column: YMC-ODS 4.6 mmØ x 250 mm, Detection: UV 220 nm, Eluent; A solution; 0.1 % TFA/water, B solution; 0.1 % TFA/acetonitrile, Flow rate: 1 ml/min., Gradient: The concentration of the B solution is increased from 10 % at a rate of 2 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.80-2.00 (2H, m), 2.10-2.25 (2H, m), 3.00-3.20 (1H, m), 3.225-3.50 (1H, m), 3.85-4.00 (1H, m), 4.05 (2H, t, J=6.3 Hz), 7.15 (2H, d, J=8.9 Hz), 7.50-7.70 (3H, m), 7.70-7.90 (4H, m), 7.95-8.05 (1H, m), 8.15 (1H, d, J=8.9 Hz), 8.89 (2H, bs), 9.13 (2H, bs) Example 59 Synthesis of (2S)-(3-(4-(4-amidinophenoxy)butanoylamino)-2-(2-nitro)benzenesulfonylaminopropanic acid TFA salt The title compound is prepared in the same manner as in Example 57. Yield: 61 mg MS (SIMS): 494 [M+1] + HPLC retention time: 23.5 min. (Column: YMC-ODS 4.6 mmØ x 250 mm, Detection: UV 220 nm, Eluent; A solution; 0.1 % TFA/water, B solution; 0.1 % TFA/acetonitrile, Flow rate: 1 ml/min., Gradient: The concentration of the B solution is increased from 10 % at a rate of 1 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.80-2.00 (2H, m), 2.15-2.30 (2H, m), 3.15-3.35 (1H, m), 3.24-3.60 (1H, m), 4.00-4.15 (3H, m), 7.14 (2H, d, J=8.9 Hz), 7.70-8.15 (7H, m), 8.42 (1H, d, J=8.9 Hz), 9.03 (2H, bs), 9.13 (2H, bs) Example 60 Synthesis of (2S)-3-(4-(4-amidinophenoxy)butanoylamino)-2-(2,4,6-trimethyl)benzenesulfonylaminopropanic acid TFA salt The title compound is prepared in the same manner as in Example 57. Yield: 43 mg MS (SIMS): 491 [M+1] + HPLC retention time: 29.4 min. (Column: YMC-ODS 4.6 mmØ x 250 mm, Detection: UV 220 nm, Eluent; A solution; 0.1 % TFA/water, B solution; 0.1 % TFA/acetonitrile, Flow rate: 1 ml/min., Gradient: The concentration of the B solution is increased from 10 % at a rate of 1 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.75-1.95 (2H, m), 2.00-2.20 (2H, m), 2.19 (3H, s), 2.50 (6H, s), 3.00-3.20 (1H, m), 3.25-3.40 (1H, m), 3.70-3.90 (1H, m), 4.01 (2H, t, J=6 Hz), 6.94 (2H, s), 7.11 (2H, d, J=8.9 Hz); 7.77 (2H, d, J=8.9 Hz), 7.85-8.00 (2H, m), 8.88 (2H, bs), 9.09 (2H, bs) Example 61 Synthesis of (2S)-3-(4-(4-amidinophenoxy)butanoylamino)-2-(4-fluoro)benzenesulfonylaminopropanic acid TFA salt The title compound is prepared in the same manner as in Example 57. Yield: 220 mg MS (SIMS): 467 [M+1] + HPLC retention time: 22.4 min. (Column: YMC-ODS 4.6 mmØ x 250 mm, Detection: UV 220 nm, Eluent; A solution; 0.1 % TFA/water, B solution; 0.1 % TFA/acetonitrile, Flow rate: 1 ml/min., Gradient: The concentration of the B solution is increased from 10 % at a rate of 1 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.80-2.00 (2H, m), 2.10-2.25 (2H, m), 3.05-3.20 (1H, m), 3.25-3.40 (1H, m), 3.80-4.00 (1H, m), 4.06 (2H, t, J=6 Hz), 7.15 (2H, d, J=8.9 Hz), 7.40 (2H, dd, J=8.9 Hz), 7.75-7.90 (4H, m), 8.02 (1H, bt, J=5.9 Hz), 8.23 (1H, d, J=9.2 Hz), 8.82 (2H, bs), 9.13 (2H, bs) Example 62 Synthesis of (2S)-3-(4-(4-amidinophenoxy)butanoylamino)-2-(1-naphthalene)sulfonylaminopropanoic acid TFA salt The title compound is prepared in the same manner as in Example 57. Yield: 67 mg MS (SIMS): 499 [M+1] + HPLC retention time: 27.3 min. (Column: YMC-ODS 4.6 mm⊘ x 250 mm, Detection: UV 220 nm, Eluent; A solution; 0.1 % TFA/water, B solution; 0.1 % TFA/acetonitrile, Flow rate: 1 ml/min., Gradient: The concentration of the B solution is increased from 10 % at a rate of 1 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.75-2.10 (4H, m), 3.05-3,20 (2H, m), 3.25-3.40 (1H, m), 3.75-3.90 (1H, m), 4.00 (2H, t, J=6 Hz), 7.13 (2H, d, J=8.9 Hz), 7.55-7.85 (4H, m), 7.80 (2H, d, J=8.9 Hz), 8.00-8.25 (4H, m), 8.64 (1H, d, J=8.3 Hz), 9.05 (2H, bs), 9.10 (2H, bs) The chemical structures of the compounds obtained in Examples 56 to 62 are as follows. Example 63 Synthesis of (2S)-3-(5-(4-amidinophenoxy)pentanoylamino)-2-(4-methoxy)benzenesulfonylaminopropanoic acid TFA salt (1) 5-(4-Cyanophenoxy)pentanoic acid ethyl ester 4-Cyanophenol (5.0 g) is dissolved in DMF (40 ml), and thereto are added ethyl 5-bromopentanoate (11.4 g) and potassium carbonate (6.38 g), and the mixture is stirred at room temperature for 24 hours. The reaction mixture is poured into water, and the mixture is extracted three times with ethyl acetate. The organic layer is washed successively with a saturated aqueous sodium hydrogen carbonate solution, water and a saturated brine, and dried over anhydrous magnesium sulfate. The desiccant is removed by filtration, and the filtrate is concentrated under reduced pressure. The residue is purified by silica gel column chromatography (silica gel; 100 g, solvent; hexane/ethyl acetate = 5:1 to 5:2). The fractions containing the title compound are concentrated under reduced pressure to give the title compound (9.86 g). 1 H-NMR (CDCl 3 ) δ (ppm): 1.26 (3H, t, J=7 Hz), 1.75-1.95 (4H, m), 2.39 (2H, t, J=6.9 Hz), 4.02 (2H, t, J=5.9 Hz), 4.14 (2H, q, J=7 Hz), 6.93 (2H, d, J=9 Hz), 7.57 (2H, d, J=9 Hz) (2) 5-(4-Amidinophenoxy)pentanoic acid The title compound is prepared from the compound (1.30 g) obtained in the above (1) in the same manner as in Example 56-(2) and -(3). Yield: 1.66 g 1 H-NMR (CD 3 OD) δ (ppm): 1.6-1.9 (4H, m), 2.31 (2H, t, J=7 Hz), 4.05 (2H, t, J=5.9 Hz), 7.06 (2H, d, J=9 Hz), 7.71 (2H, d, J=9 Hz) (3) (2S)-3-(5-(4-Amidinophenoxy)pentanoylamino)-2-(4-methoxy)benzenesulfonylaminopropanoic acid TFA salt The title compound is prepared from the compound (134 mg) obtained in the above (2) and the compound (154 mg) obtained in Example 57-(1) in the same manner as in Example 56-(5). Yield: 91 mg MS (SIMS): 493 [M+1] + HPLC retention time: 24.1 min. (Column: YMC-ODS 4.6 mmØ x 250 mm, Detection: UV 220 nm, Eluent; A solution; 0,1 % TFA/water, B solution; 0.1 % TFA/acetonitrile, Flow rate: 1 ml/min., Gradient: The concentration of the B solution is increased from 10 % at a rate of 1 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.50-1.80 (4H, m), 2.00-2.15 (2H, m), 3.00-3.20 (1H, m), 3.20-3.20 (1H, m), 3.75-3.90 (1H, m), 3.81 (3H, s), 4.06 (2H, bt, J=6 Hz), 7.06 (2H, d, J=8.9 Hz), 7.14 (2H, d, J=8.9 Hz), 7.69 (2H, d, J=8.9 Hz), 7.80 (2H, d, J=8.9 Hz), 7.85-8.00 (2H, m), 8.86 (2H, bs), 9.12 (2H, bs) Example 64 Synthesis of (2S)-3-(5-(4-amidinophenoxy)pentanoylamino)-2-benzenesulfonylaminopropanoic acid TFA salt The title compound is prepared in the same manner as in Example 63. Yield: 283 mg MS (SIMS): 463 [M+1] + HPLC retention time: 22.5 min. (Column: YMC-ODS 4.6 mmØ x 250 mm, Detection: UV 220 nm, Eluent; A solution; 0.1 % TFA/water, B solution; 0.1 % TFA/acetonitrile, Flow rate: 1 ml/min., Gradient: The concentration of the B solution is increased from 10 % at a rate of 1 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.50-1.80 (4H, m), 2.00-2.10 (2H, m), 3.00-3.15 (1H, m), 3.25-3.35 (1H, m), 3.80-3.95 (1H, m), 4.06 (2H, bt, J=6 Hz), 7.15 (2H, d, J=8.9 Hz), 7.50-7.65 (3H, m), 7.70-7.85 (4H, m), 7.90 (1H, bt, J=5.6 Hz), 8.12 (1H, d, J=9.2 Hz), 8.90 (2H, bs), 9.12 (2H, bs) Example 65 Synthesis of (2S)-3-(5-(4-amidinophenoxy)pentanoylamino)-2-butanesulfonylaminopropanoic acid TFA salt The title compound is prepared in the same manner as in Example 63. Yield: 324 mg MS (SIMS): 443 [M+1] + HPLC Retention time: 22.1 min. (Column: YMC-ODS 4.6 mmØ x 250 mm, Detection: UV 220 nm, Eluent; A solution; 0.1 % TFA/water, B solution; 0.1 % TFA/acetonitrile, Flow rate: 1 ml/min., Gradient: The concentration of the B solution is increased from 10 % at a rate of 1 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm): 0.84 (3H, t, J=7 Hz), 1.25-1.45 (2H, m), 1.50-1.80 (6H, m), 2.15 (2H, bt, J=7 Hz), 2.90-3.00 (2H, m), 3.15-3.50 (2H, m), 3.90-4.00 (1H, m), 4.07 (2H, bt, J=6 Hz), 7.14 (2H, d, J=8.9 Hz), 7.53 (1H, d, J=9.2 Hz), 7.81 (2H, d, J=8.9 Hz), 7.99 (1H, bt, J=6 Hz), 8.95 (2H, bs), 9.12 (2H, bs) The chemical structures of the compounds obtained in Example 63 to 65 are as follows. Example 69 Synthesis of (2S)-3-(2-(1-(4-amidinophenyl)-4-piperidyl)ethanoylamino)-2-benzenesulfonylaminopropanoic acid TFA salt (1) 4-Carboxyethoxymethylpiperidine hydrochloride The compound (2.19 g) obtained in Example 6-(1) is dissolved in 4N hydrogen chloride-dioxane (30 ml), and the mixture is stirred at room temperature for 30 minutes. The reaction mixture is concentrated under reduced pressure to give the title compound (1.77 g) as a colorless powder. (2) 2-(1-(4-Cyanophenyl)-4-piperidyl)ethanoic acid ethyl ester The compound (1.77 g) obtained in the above (1) is dissolved in DMSO (30 ml), and thereto are added 4-chlorobenzonitrile (982 mg), and sodium carbonate (3.03 g), and the mixture is heated with stirring at 160°C for 12.5 hours. After cooling, the reaction mixture is poured into water, and extracted three times with chloroform. The organic layer is washed with a saturated brine, and dried over anhydrous magnesium sulfate. The desiccant is removed by filtration, and the filtrate is concentrated under reduced pressure. The residue is purified by silica gel column chromatography (silica gel; 100 g, solvent; hexane/ethyl acetate = 3:1). The fractions containing the title compound are concentrated under reduced pressure to give the title compound (1.38 g) as an oily product. 1 H-NMR (CDCl 3 ) δ (ppm): 1.27 (3H, t, J=7 Hz), 1.35 (2H, m), 1.90 (2H, m), 2.10 (1H, m), 2.27 (2H, d, J=6.9 Hz), 2.90 (2H, m), 3.86 (2H, m), 4.15 (2H, q, J=7 Hz), 6.85 (2H, d, J=9 Hz), 7.47 (2H, d, J=9 Hz) (3) 2-(1-(4-Cyanophenyl)-4-piperidyl)ethanoic acid The compound (1.38 g) obtained in the above (2) is dissolved in a mixture of methanol (20 ml) and THF (10 ml), and thereto is added an aqueous sodium hydroxide solution (NaOH; 2.1 g, water; 10 ml), and the mixture is stirred at room temperature for 30 minutes. The pH value of the mixture is adjusted to pH 1 with conc. hydrochloric acid, and the reaction mixture is concentrated under reduced pressure. To the residue is added isopropanol, and the mixture is stirred at room temperature for one hour, and the precipitates are removed by filtration. The filtrate is concentrated under reduced pressure to give the title compound (1.20 g) as a powder. (4) (2S)-2-Benzenesulfonylamino-3-(2-(1-(4-cyanophenyl)-4-piperidyl)ethanoylamino)propanoic acid ethyl ester The compound (300 mg) obtained in Example 54-(4) is subjected to de-t-butoxycarbonylation in the same manner as in Example 66-(2), and the resultant is condensed with the compound (236 mg) obtained in the above (3) to give the title compound (411 mg). 1 H-NMR (CDCl 3 ) δ (ppm): 1.15 (3H, t, J=8.9 Hz), 1.30-2.30 (7H, m), 2.90 (2H, m), 3.40-4.20 (7H, m), 5.68 (1H, m), 6.10 (1H, m), 6.85 (2H, d, J=9 Hz), 7.40-7.70 (5H, m), 7.85 (2H, d, J=9 Hz) (5) (2S)-3-(2-(1-(4-Amidinophenyl)-4-piperidyl)ethanoylamino)-2-benzenesulfonylaminopropanoic acid ethyl ester hydroiodide The title compound is prepared from the compound (411 mg) obtained in the above (4) in the same manner as in Example 56-(2). Yield: 739 mg (6) (2S)-3-(2-(1-(4-Amidinophenyl)-4-piperidyl)ethanoylamino)-2-benzenesulfonylaminopropanoic acid TFA salt The title compound is prepared from the compound (739 mg) obtained in the above (5) in the same manner as in Example 66-(4). Yield: 150 mg MS (SIMS): 488 [M+1] + HPLC retention time: 22.9 min. (Column: YMC-ODS 4.6 mmØ x 250 mm, Detection: UV 220 nm, Eluent; A solution; 0.1 % TFA/water, B solution; 0.1 % TFA/acetonitrile, Flow rate: 1 ml/min., Gradient: The concentration of the B solution is increased from 10 % at a rate of 1 %/min. ) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.05-1.22 (2H, m), 1.60-1.78 (2H, m), 1.82-2.00 (3H, m), 2.87-2.95 (2H, m), 3.05.3.18 (1H, m), 3.21-3.37 (1H, m), 3.83-4.00 (3H, m), 7.04 (2H, d, J=9 Hz), 7.50-7.80 (7H, m), 7.93 (1H, t, J=6 Hz), 8.14 (1H, d, J=9 Hz), 8.54 (2H, bs), 8.88 (2H, s) Example 70 Synthesis of (2S)-2-(4-methoxy)benzenesulfonylamino-3-(1-(3-(4-piperidyl)propanoyl)-3-piperidylcarbonylamino)propanoic acid TFA salt (1) N-t-Butoxycarbonylnipecotic acid Nipecotic acid (5.0 g) is suspended in a mixture of 1,4-dioxane (30 ml) and aqueous sodium hydroxide solution (NaOH; 1.6 g, water; 30 ml), and thereto is added (Boc) 2 O (9.3 g) under ice-cooling, and the mixture is stirred for five hours. The reaction mixture is washed with ether, and the pH value of the mixture is adjusted to pH 1 with 1N hydrochloric acid, and extracted twice with ethyl acetate. The organic layer is washed with a saturated brine, and dried over anhydrous magnesium sulfate. The desiccant is removed by filtration, and the filtrate is concentrated under reduced pressure to give the title compound (8.78 g) as a colorless powder. (2) (2S)-3-(1-t-Butoxycarbonyl-3-piperidyl)carbonylamino-2-(4-methoxy)benzenesulfonylaminopropanoic acid ethyl ester The compound (300 mg) obtained in Example 57-(1) is subjected to de-t-butoxycarbonylation in the same manner as in Example 66-(2), and the resultant is condensed with the compound (178 mg) obtained in the above (1) to give the title compound (440 mg). (3) (2S)-3-(1-(3-(1-t-Butoxycarbonyl-4-piperidyl)propanoyl)-3-piperidyl)carbonylamino-2-(4-methoxy)benzenesulfonylaminopropanoic acid ethyl ester The compound (440 mg) obtained in the above (2) is subjected to de-t-butoxycarbonylation in the same manner as in Example 66-(2), and the resultant is condensed with the compound (249 mg) obtained in Example 2-(3) to give the title compound (600 mg). (4) (2S)-2-(4-Methoxy)benzenesulfonylamino-3-(1-(3-(4-piperidyl)propanoyl)-3-piperidyl)carbonylaminopropanoic acid TFA salt The title compound is prepared from the compound (600 mg) obtained in the above (3) in the same manner as in Example 2-(7) to give the title compound as a colorless powder. Yield: 388 mg MS (SIMS): 525 [M+1] + HPLC retention time: 23.80 min., 24.5 min. (diastereomer mixture) (Column: YMC-ODS 4.6 mmØ x 250 mm, Detection: UV 220 nm, Eluent; A solution; 0.1 % TFA/water, B solution; 0.1 % TFA/acetonitrile, Flow rate: 1 ml/min., Gradient: The concentration of the B solution is increased from 10 % at a rate of 1 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.10-1.88 (11H, m), 1.95-2.62 (5H, m), 2.70-3.90 (11H, m), 4.10-4.40 (1H, m), 7.07 (2H, d, J=9 Hz), 7.69 (2H, d, J=9 Hz), 7.90-8.10 (2H, m), 8.20 (1H, bs), 8.50 (1H, bs) The chemical structures of the compounds obtained in Example 69 to 70 are as follows. Example 69 Example 70 Example 71 Platelet aggregation inhibitory activity The compounds of Examples 18 to 70 were tested in the same manner as in Example 17. The test results of the test compounds are shown in Table 2. Test results Test Compound IC 50 (nM) The compound of Example 18 33 The compound of Example 19 30 The compound of Example 20 57 The compound of Example 21 15 The compound of Example 24 30 The compound of Example 25 22 The compound of Example 26 29 The compound of Example 27 26 The compound of Example 28 58 The compound of Example 29 170 The compound of Example 30 16 The compound of Example 31 142 The compound of Example 32 151 The compound of Example 33 15 The compound of Example 34 126 The compound of Example 35 25 The compound of Example 36 62 The compound of Example 37 48 The compound of Example 38 35 The compound of Example 39 185 The compound of Example 40 3 The compound of Example 41 35 The compound of Example 42 233 The compound of Example 43 260 The compound of Example 44 263 The compound of Example 45 121 The compound of Example 46 32 The compound of Example 47 238 The compound of Example 48 67 The compound of Example 49 170 The compound of Example 50 203 The compound of Example 53 111 The compound of Example 54 79 The compound of Example 55 300 The compound of Example 56 90 The compound of Example 57 18 The compound of Example 58 96 The compound of Example 59 34 The compound of Example 60 31 The compound of Example 61 24 The compound of Example 62 26 The compound of Example 63 15 The compound of Example 64 32 The compound of Example 65 79 The compound of Example 69 29 The compound of Example 70 57 Example 72 Synthesis of (2S)-2-(5-methoxy-1-naphthalene)sulfonylamino-3-(3-(3-(4-piperidyl)propanoylamino)propanoylamino)propanoic acid TFA salt The title compound is prepared in the same manner as in Example 2. Yield: 162 mg MS (SIMS): 535 [M+1] + HPLC retention time: 24.9 min. (under the same conditions as Example 1) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.12-1.32 (2H, m), 1.37-1.52 (3H, m), 1.70-1.82 (2H, m), 1.90-2.10 (4H, m), 2.72-2.90 (2H, m), 3.00-3.30 (4H, m), 3.75-3.90 (1H, m), 4.05 (3H, s), 7.06 (1H, d, J=8 Hz), 7.59-7.76 (3H, m), 7.86 (1H, t, J=8 Hz), 8.07 (1H, d, J=8 Hz), 8.15-8.31 (3H, m), 8.46-8.62 (2H, m) Example 73 Synthesis of (2R)-3-(3-(4-amidinobenzoylamino)propanoylamino)-2-benzenesulfonylaminopropanoic acid TFA salt The title compound is prepared in the same manner as in Example 1. Yield: 99 mg MS (SIMS): 462 [M+1] + HPLC retention time: 14.6 min. (under the same conditions as Example 1) 1 H-NMR (DMSO-d 6 ) δ (ppm): 2.20-2.36 (2H, m), 3.05-3.55 (4H, m), 3.85-3.96 (1H, m), 7.50-7.76 (3H, m), 7.77 (2H, d, J=6 Hz), 7.88 (2H, d, J=8 Hz), 7.96-8.09 (4H, m), 8.15 (1H, d, J=9 Hz), 8.70 (1H, t, J=6 Hz), 9.23 (2H, s), 9.40 (2H, s) The chemical structures of the compounds obtained in Examples 72 and 73 are as follows. Example 72 Example 73 Example 74 Synthesis of (2S)-3-(3-(4-amidinobenzoylamino)propanoylamino)-2-(2-methyl)benzenesulfonylaminopropanoic acid TFA salt The title compound is prepared in the same manner as in Example 19. Yield: 73 mg MS (SIMS): 476 [M+1] + HPLC retention time: 18.7 min. (under the same conditions as Example 1) 1 H-NMR (DMSO-d 6 ) δ (ppm): 2.20-2.40 (2H, m), 2.58 (3H, s), 3.08-3.40 (4H, m), 3.78-3.90 (1H, m), 7.30-7.55 (3H, m), 7.79 (1H, d, J=8 Hz), 7.85-8.09 (5H, m), 8.15 (1H, d, J=8 Hz), 8.70 (1H, m), 9.25 (2H, s), 9.40 (2H, s) Example 75 Synthesis of (2S)-3-(3-(4-amidinobenzoylamino)propanoylamino)-2-(3-methyl)benzenesulfonylaminopropanoic acid TFA salt The title compound is prepared in the same manner as in Example 19. Yield: 90 mg MS (SIMS): 476 [M+1] + HPLC retention time: 19.5 min. (under the same conditions as Example 1) 1 H-NMR (DMSO-d 6 ) δ (ppm): 2.20-2.35 (2H, m), 2.36 (3H, s), 3.05-3.45 (4H, m), 3.85-3.95 (1H, m), 7.37-7.62 (4H, m), 7.81-8.14 (6H, m), 8.70 (1H, m), 9.28 (2H, m), 9.40 (2H, s) Example 76 Synthesis of (2S)-3-(3-(4-amidinobenzoylamino)propanoylamino)-2-(4-methyl)benzenesulfonylaminopropanoic acid TFA salt The title compound is prepared in the same manner as in Example 19. Yield: 186 mg MS (SIMS): 476 [M+1] + HPLC retention time: 19.5 min. (under the same conditions as Example 1) 1 H-NMR (DMSO-d 6 ) δ (ppm): 2.23-2.35 (2H, m), 2.36 (3H, s), 3.05-3.50 (4H, m), 3.83-3.94 (1H, m), 7.36 (2H, d, J=8 Hz), 7.65 (2H, d, J=8 Hz), 7.84-8.10 (6H, m), 8.66-8.75 (1H, m), 9.29 (2H, s), 9.40 (2H, s) Example 77 Synthesis of (2S)-3-(3-(4-amidinobenzoylamino)propanoylamino)-2-(2-nitro)benzenesulfonylaminopropanoic acid TFA salt To a solution of (2S)-2-(2-nitro)benzenesulfonylamino-3-(3-(t-butoxycarbonylamino)propanoylamino)propanoic acid ethyl ester (0.701 g), which is prepared in the same manner as in Example 1-(4) and -(5), in acetonitrile (2 ml) is added dropwise a solution of methanesulfonic acid (0.690 g) in acetonitrile at a temperature below 20°C, and the mixture is stirred at room temperature for 30 minutes. To the mixture are added successively DMF (10 ml) and triethylamine (741 mg) at a temperature below 20°C. To the mixture are added N-t-butoxycarbonyl-4-amidinobenzoic acid (0.417 g), which is prepared in Example 1-(7), and HOBT·H 2 O (0.213 g), and further thereto is added WSC·HCl (0.303 g) at 5-10°C, and the mixture is stirred for 30 minutes. The mixture is further stirred at room temperature for 12 hours, and the reaction mixture is concentrated under reduce pressure. To the residue is added TFA (10 ml) under ice-cooling, and the mixture is stirred at room temperature for one hour. The mixture is evaporated under reduced pressure to remove the TFA, and thereto is added ether, and the supernatant is removed. To the residue are added acetic acid (20 ml) and 1N hydrochloric acid (20 ml), and the mixture is heated with stirring at 50-60°C for 13 hours. The reaction mixture is concentrated under reduced pressure, and the residue is purified by HPLC to give a white powder (357 mg). MS (SIMS): 507 [M+1] + HPLC retention time: 18.3 min. (under the same conditions as Example 1) 1 H-NMR (DMSO-d 6 ) δ (ppm): 2.28-2.42 (2H, m), 3.15-3.40 (4H, m), 4.03-4.16 (1H, m), 7.80-8.07 (8H, m), 8.09-8.17 (1H, m), 8.41 (1H, d, J=8 Hz), 8.71 (1H, t, J=5 Hz), 9.28 (2H, s), 9.40 (2H, s) Example 78 Synthesis of (2S)-3-(3-(4-amidinobenzoylamino)propanoylamino)-2-(4-fluoro)benzenesulfonylaminopropanoic acid TFA salt The title compound is prepared in the same manner as in Example 19. Yield: 137 mg MS (SIMS): 480 [M+1] + HPLC retention time: 17.3 min. (under the same conditions as Example 1) 1 H-NMR (DMSO-d 6 ) δ (ppm): 2.31 (2H, t, J=8 Hz), 3.05-3.45 (4H, m), 3.85-3.97 (1H, m), 7.40 (2H, dd, J=8.5, 9 Hz), 7.82 (2H, dd, J=8.5, 9 Hz), 7.88 (2H, d, J=8.5 Hz), 8.01 (2H, d, J=8.5 Hz), 8.06 (1H, m), 8.22 (1H, d, J=9 Hz), 8.71 (1H, t, J=5 Hz), 9.23 (2H, s), 9.40 (2H, s) Example 79 Synthesis of (2S)-3-(3-(4-amidinobenzoylamino)propanoylamino)-2-(4-ethyl)benzenesulfonylaminopropanoic acid ethyl ester The title compound is prepared in the same manner as in Example 22. Yield: 120 mg MS (SIMS): 518 [M+1] + HPLC retention time: 29.1 min. (under the same conditions as Example 1) 1 H-NMR (DMSO-d 6 ) δ (ppm): 0.97 (3H, t, J=7 Hz), 1.17 (3H, t, J=7 Hz), 2.31 (2H, t, J=7 Hz), 2.66 (2H, q, J=7 Hz), 3.10-3.49 (4H, m), 3.76 (2H, q, J=7 Hz), 3.89-4.00 (1H, m), 7.40 (2H, d, J=9 Hz), 7.66 (2H, d, J=9 Hz), 7.88 (2H, d, J=9 Hz), 8.06 (2H, d, J=9 Hz), 8.09 (1H, t, J=6 Hz), 8.26 (1H, d, J=9 Hz), 8.72 (1H, t, J=5.5 Hz), 9.29 (2H, s), 9.40 (2H, s) Example 80 Synthesis of (2S)-3-(3-(4-amidinobenzoylamino)propanoylamino)-2-(4-ethyl)benzenesulfonylaminopropanoic acid TFA salt To the compound (120 mg) obtained in Example 79 are added 1N hydrochloric acid (5 ml) and acetic acid (5 ml), and the mixture is heated with stirring at 60°C for 18 hours. The reaction mixture is concentrated under reduced pressure, and purified by HPLC to give the title compound (90.4 mg) as a white powder. MS (SIMS): 490 [M+1] + HPLC retention time: 23.5 min. (under the same conditions as Example 1) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.17 (3H, t, J=8 Hz), 2.23-2.36 (2H, m), 2.66 (2H, q, J=8 Hz), 3.08-3.50 (4H, m), 3.78 (1H, m), 7.38 (2H, d, J=8 Hz), 7.68 (2H, d, J=8 Hz), 7.87 (2H, d, J=8 Hz), 7.80-7.90 (1H, m), 7.94-8.05 (1H, m), 8.02 (2H, d, J=8 Hz), 8.72 (1H, t, J=5 Hz), 9.36 (2H, s), 9.42 (2H, s) Example 81 Synthesis of (2S)-3-(3-(4-amidinobenzoylamino)propanoylamino)-2-(2-amino)benzenesulfonylaminopropanoic acid TFA salt To a solution of the compound (85 mg) obtained in Example 77 in ethanol (5 ml) is added 10 % palladium-carbon (50 % wet, 100 mg), and the mixture is stirred at room temperature for 3 hours under hydrogen atmosphere. The insoluble materials are removed by filtration and the filtrate is concentrated under reduced pressure. The residue is purified by HPLC to give the title compound (58 mg). MS (SIMS): 477 [M+1] + HPLC retention time: 15.1 min. (under the same conditions as Example 1) 1 H-NMR (DMSO-d 6 ) δ (ppm): 2.28-2.37 (2H, m), 3.06-3.19 (2H, m), 3.26-3.49 (4H, m), 3.72-3.85 (1H, m), 6.57 (1H, t, J=7 Hz), 6.78 (1H, d, J=7 Hz), 7.23 (1H, t, J=7 Hz), 7.45 (1H, d, J=7 Hz), 7.84-8.05 (6H, m), 8.70 (1H, t, J=5.5 Hz), 9.18 (2H, s), 9.40 (2H, s) The chemical structures of the compounds obtained in Examples 74 to 81 are as follows. Example 82 Synthesis of (2S)-3-(4-(4-amidinophenoxy)butanoylamino)-2-(2-trifluoromethyl)benzenesulfonylaminopropanoic acid TFA salt The title compound is prepared in the same manner as in Example 57. Yield: 295 mg MS (SIMS): 517 [M+1] + HPLC retention time: 26.2 min. (under the same conditions as Example 1) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.80-2.00 (2H, m), 2.15-2.25 (2H, m), 3.25-3.50 (2H, m), 3.95-4.15 (3H, m), 7.14 (2H, d, J=8.9 Hz), 7.70-8.00 (5H, m), 8.00-8.20 (2H, m), 8.21 (1H, d, J=9.2 Hz), 8.87 (2H, bs), 9.13 (2H, bs) Example 83 Synthesis of (2S)-3-(4-(4-amidinophenoxy)butanoylamino)-2-(4-ethyl)-benzenesulfonylaminopropanoic acid TFA salt The title compound is prepared in the same manner as in Example 57. Yield: 241 mg MS (SIMS): 477 [M+1] + HPLC retention time: 27.1 min. (under the same conditions as Example 1) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.17 (3H, t, J=8 Hz), 1.80-2.00 (2H, m), 2.05-2.25 (2H, m), 2.65 (2H, q, J=8 Hz), 3.00-3.20 (1H, m), 3.25-3.45 (1H, m), 3.80-3.95 (1H, m), 4.05 (2H, t, J=6.0 Hz), 7.14 (2H, d, J=8.9 Hz), 7.38 (2H, d, J=8.6 Hz), 7.67 (2H, d, J=8.6 Hz), 7.81 (2H, d, J=8.9 Hz), 7.99 (1H, t, J=6 Hz), 8.06 (1H, d, J=8.9 Hz), 9.02 (2H, bs), 9.14 (2H, bs) Example 84 Synthesis of (2S)-3-(4-(4-amidinophenoxy)butanoylamino)-2-(2-amino)benzenesulfonylaminopropanoic acid TFA salt To a solution of the compound (100 mg) obtained in Example 59 in ethanol (10 ml) is added 10 % palladium-carbon (50 % wet, 150 mg), and the mixture is subjected to hydrogenation at room temperature for 3.5 hours. The catalyst is removed by filtration, and the filtrate is concentrated under reduced pressure. The residue is purified by HPLC to give the title compound (50 mg) as a white powder. MS (SIMS): 464 [M+1] + HPLC retention time: 19.8 min. (under the same conditions as Example 1) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.80-2.00 (2H, m), 2.05-2.25 (2H, m), 3.00-3.50 (2H, m), 3.70-3.85 (1H, m), 4.05 (2H, bt, J=6 Hz), 6.50-6.60 (1H, m), 6.77 (1H, dd, J=0.7, 8.2 Hz), 7.14 (2H, d, J=8.9 Hz), 7.22 (1H, ddd, J=1.7, 7.3, 8.6 Hz), 7.44 (1H, dd, J=1.3, 7.9 Hz), 7.80 (2H, d, J=8.9 Hz), 7.90 (1H, bt, J=5.9 Hz), 7.95 (1H, d, J=8.9 Hz), 8.87 (2H, bs), 9.12 (2H, bs) Example 85 Synthesis of (2S)-3-(5-(4-amidinophenoxy)pentanoylamino)-2-(2-nitro)benzenesulfonylaminopropanoic acid TFA salt The title compound is prepared in the same manner as in Example 63. Yield: 69 mg MS (SIMS): 508 [M+1] + HPLC retention time: 25.5 min. (under the same conditions as Example 1) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.50-1.80 (4H, m), 2.00-2.20 (2H, m), 3.15-3.55 (2H, m), 4.00-4.15 (3H, m), 7.15 (2H, d, J=8.9 Hz), 7.75-8.10 (7H, m), 8.39 (1H, d, J=8.9 Hz), 8.88 (2H, bs), 9.12 (2H, bs) Example 86 Synthesis of (2S)-3-(5-(4-amidinophenoxy)pentanoylamino)-2-(2,4,6-trimethyl)benzenesulfonylaminopropanoic acid TFA salt The title compound is prepared in the same manner as in Example 63. Yield: 191 mg MS (SIMS): 505 [M+1] + HPLC retention time: 30.6 min. (under the same conditions as Example 1) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.45-1.80 (4H, m), 1.90-2.10 (2H, m), 2.23 (3H, s), 2.49 (3H, s), 2.51 (3H, s), 3.00-3.40 (2H, m), 3.70-3.90 (1H, m), 4.00-4.15 (2H, m), 6.98 (2H, s), 7.14 (2H, d, J=8.9 Hz), 7.80 (2H, d, J=8.9 Hz), 7.85-8.00 (2H, m), 8.85 (2H, bs), 9.12 (2H, bs) The chemical structures of the compounds obtained in Examples 82 to 86 are as follows. Example 93 Synthesis of (2S)-3-(2-(1-(4-amidinophenyl)-4-piperidyl)ethanoylamino)-2-(4-methoxy)benzenesulfonylaminopropanoic acid TFA salt The title compound is prepared in the same manner as in Example 69. Yield: 160 mg MS (SIMS): 518 [M+1] + HPLC retention time: 24.3 min. (under the same conditions as Example 1) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.05-1.22 (2H, m), 1.61-1.74 (2H, m), 1.80-2.00 (3H, m), 2.80-2.95 (2H, m), 3.05-3.18 (2H, m), 3.24-3.36 (2H, m), 3.85-4.00 (1H, m), 3.81 (3H, s), 6.99-7.14 (4H, m), 7.68-7.75 (4H, m), 7.94 (2H, d, J=9 Hz), 8.53 (2H, s), 8.88 (2H, s) Example 94 Synthesis of (2S)-3-(5-(4-amidinobenzoyl)pentanoylamino)-2-benzenesulfonylaminopropanoic acid TFA salt (1) 6-(p-Cyanophenyl)hexanoic acid methyl ester To a solution of 6-(p-cyanophenyl)hexanoic acid (1.0 g), which is disclosed in J. Med. Chem., 36, 1811 (1993), in methylene chloride (10 ml) are added methanol (0.2 ml), WSC·HCl (883 mg) and 4-dimethylaminopyridine (561 mg), and the mixture is stirred at room temperature for 30 minutes. The mixture is diluted with ethyl acetate, and washed with 1N hydrochloric acid and a saturated aqueous sodium hydrogen carbonate solution, and purified by silica gel column chromatography (n-hexane/ethyl acetate = 5:1) to give the title compound (600 mg). Yield: 56 % 1 H-NMR (CDCl 3 ) δ (ppm): 1.25-1.45 (2H, m), 1.55-1.75 (4H, m), 2.31 (2H, t, J=7 Hz), 2.67 (2H, t, J=8 Hz), 3.66 (3H, s), 7.27 (2H, d, J=8.6 Hz), 7.57 (2H, d, J=8.6 Hz) (2) 5-(4-Cyanobenzoyl)pentanoic acid methyl ester The compound (620 mg) obtained in the above (1) is dissolved in a mixture of acetic acid (30 ml) and water (5 ml), and thereto is added chromic anhydride (1.3 g)/acetic acid (2 ml), and the mixture is stirred at room temperature for 17.5 hours. The mixture is diluted with ethyl acetate, and washed with a saturated aqueous sodium hydrogen carbonate solution, and purified by silica gel column chromatography (n-hexane/ethyl acetate = 5:1 → 2:1) to give the title compound (70 mg, 11 %), and the starting compound (365 mg, 59 %) is also recovered. 1 H-NMR (CDCl 3 ) δ (ppm): 1.60-1.90 (4H, m), 2.39 (2H, t, J=7 Hz), 3.02 (2H, t, J=6.9 Hz), 3.68 (3H, s), 7.78 (2H, d, J=8.6 Hz), 8.05 (2H, d, J=8.6 Hz) (3) (2S)-2-Benzenesulfonylamino-3-(5-(4-cyanobenzoyl)pentanoylamino)propanoic acid ethyl ester The compound (70 mg) obtained in the above (2) is dissolved in a mixture of methanol (1.5 ml) and THF (1.5 ml), and thereto is added a solution of lithium hydroxide (34 mg) in water (1.5 ml), and the mixture is stirred at room temperature for one hour. The mixture is concentrated under reduced pressure, and the pH value of the residue is adjusted to pH 2 with 1N hydrochloric acid, and extracted with ethyl acetate. The extract is evaporated to remove the solvent to give a carboxylic acid compound (58 mg, 87 %). The carboxylic acid compound and the compound obtained in Example 54-(4), (2S)-2-benzenesulfonylamino-3-t-butoxycarbonylaminopropanoic acid ethyl ester (130 mg) are treated in the same manner as in Example 66-(2) to give the title compound (93 mg, 73 %). 1 H-NMR (CDCl 3 ) δ (ppm): 1.11 (3H, t, J=7.3 Hz), 1.60-1.90 (4H, m), 2.25 (2H, t, J=7 Hz), 3.02 (2H, t, J=7 Hz), 3.50-3.75 (2H, m), 3.90-4.05 (3H, m), 6.11 (1H, bs), 6.47 (1H, m), 7.40-7.65 (3H, m), 7.70-7.90 (4H, m), 8.05 (2H, d, J=8.6 Hz) (4) (2S)-3-(5-(4-Amidinobenzoyl)pentanoylamino)-2-benzenesulfonylaminopropanoic acid TFA salt The compound obtained in the above (3) is treated in the same manner in Example 19-(2) to give the title compound. Yield: 16 mg MS (SIMS): 475 [M+1] + HPLC retention time: 21.1 min. (under the same conditions as Example 1) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.35-1.70 (4H, m), 1.90-2.15 (2H, m), 3.00-3.40 (4H, m), 3.70-4.00 (1H, m), 7.50-7.65 (3H, m), 7.70-8.00 (5H, m), 8.05-8.25 (3H, m), 9.26 (2H, bs), 9.44 (2H, bs) Example 95 Synthesis of (2S)-3-((1-(4-amidinobenzoyl)-3-piperidyl)carbonylamino)-2-benzenesulfonylaminopropanoic acid TFA salt (1) (2S)-3-(1-t-Butoxycarbonyl-3-piperidyl)carbonylamino-2-benzenesulfonylaminopropanoic acid ethyl ester To a solution of the compound (252 mg) obtained in Example 54-(4) in acetonitrile (1.5 ml) is added dropwise a solution of methanesulfonic acid (325 mg) in acetonitrile (1.5 ml), and the mixture is stirred at 20°C for 30 minutes. To the mixture are added dropwise DMF (5 ml) and triethylamine (343 mg) at 5-10°C, and further thereto are added the compound (162 mg) obtained in Example 70-(1), HOBT·H 2 O (124 mg) and then further WSC·HCl (156 mg). The mixture is stirred at 5-10°C for 30 minutes, and further stirred at room temperature for four hours. The reaction mixture is poured into water, and extracted three times with ethyl acetate. The combined ethyl acetate layers are washed successively with 1N hydrochloric acid, a saturated aqueous sodium hydrogen carbonate solution and a saturated brine (each twice), and dried over magnesium sulfate. The desiccant is removed by filtration, and the filtrate is concentrated under reduced pressure to give the title compound (373 mg) as an oily product. (2) (2S)-3-((1-(4-Cyanobenzoyl)-3-piperidyl)carbonylamino)-2-benzenesulfonylaminopropanoic acid To a solution of the compound (373 mg) obtained in the above (1) in acetonitrile (1.5 ml) is added dropwise a solution of methanesulfonic acid (380 mg) in acetonitrile (1.5 ml), and the mixture is stirred at room temperature for 30 minutes. To the mixture are added dropwise DMF (4 ml) and triethylamine (400 mg) at 5-10°C under ice-cooling, and further thereto are added 4-cyanobenzoic acid (129 mg), HOBT·H 2 O (146 mg) and then further WSC·HCl (183 mg). The mixture is stirred at 5-10°C for 30 minutes, and further stirred at room temperature for 12 hours. The reaction mixture is poured into water, and extracted with ethyl acetate. The combined organic layers are washed successively with 1N hydrochloric acid, a saturated aqueous sodium hydrogen carbonate solution and a saturated brine (each twice), and dried over magnesium sulfate. The desiccant is removed by filtration, and the filtrate is concentrated under reduced pressure to give the title compound (390 mg) as a white powder. (3) (2S)-3-((1-(4-amidinobenzoyl)-3-piperidyl)carbonylamino)-2-benzenesulfonylaminopropanoic acid TFA salt To a solution of the compound (390 mg) obtained in the above (2) in a mixture of pyridine (10 ml) and triethylamine (2 ml) is brown hydrogen sulfide gas for one hour, and the mixture is allowed to stand at room temperature for 20 hours. The hydrogen sulfide gas is removed by using nitrogen gas, and the reaction mixture is concentrated to dryness under reduced pressure. To the residue are added acetone (10 ml) and methyl iodide (0.25 ml), and the mixture is heated with stirring at 50-60°C for 1.5 hour, and the mixture is concentrated to dryness under reduced pressure. To the resulting residue are added methanol (10 ml) and ammonium acetate (121 mg), and the mixture is heated with stirring at 70-80°C for two hours, and then the reaction mixture is concentrated to dryness under reduced pressure. To the residue are added 1N hydrochloric acid (15 ml) and acetic acid (15 ml), and the mixture is heated with stirring at 60°C for 30 hours. The mixture is concentrated under reduced pressure, and purified by HPLC to give the title compound (118 mg) as a white powder. MS (SIMS): 502 [M+1] + HPLC retention time: 20.4 min., 21.7 min. (a diastereomer mixture) (under the same conditions as Example 1) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.30-1.95 (4H, m), 2.15-2.38 (1H, m), 2.75-3.60 (5H, m), 3.75-3.99 (1H, m), 4.25-4.50 (1H, m), 7.47-8.22 (11H, m), 9.25 (2H, s), 9.37 (2H, s) Example 96 Synthesis of (2S)-3-(3-(4-amidinobenzoylmethylamino)propanoylamino)-2-benzensulfonylaminopropanoic acid TFA salt (1) (2S)-2-Benzenesulfonylamino-3-(3-(t-butoxycarbonylmethylamino)propanoylamino)propanoic acid ethyl ester The compound (500 mg) obtained in Example 54-(3) and N-methyl-N-Boc-β-alanine (333 mg) are treated in the same manner as in Example 1-(4), -(5) to give the title compound (659 mg). (2) (2S)-3-(3-(4-Amidinobenzoylmethylamino)propanoylamino)-2-benzenesulfonylaminopropanoic acid TFA salt The compound (659 mg) obtained in the above (1) is treated in the same manner as in Example 77 to give the title compound (187 mg) as a white powder. MS (SIMS): 476 [M+1] + HPLC retention time: 15.3 min. (under the same conditions as Example 1) 1 H-NMR (DMSO-d 6 ) δ (ppm): 2.20-2.43 (2H, m), 2.83, 2.93 (total 3H, each s), 3.02-3.67 (4H, m), 3.76-4.00 (1H, m), 7.50-7.95 (9H, m), 8.04-8.23 (2H, m), 9.20 (2H, s), 9.38 (2H, s) Example 97 Synthesis of (2S)-3-(3-(4-amidinobenzoylmethylamino)propanoylamino)-2-(4-ethyl)benzenesulfonylaminopropanoic acid TFA salt The title compound is prepared in the same manner as in Example 96. Yield: 141 mg MS (SIMS): 504 [M+1] + HPLC retention time: 23.5 min. (under the same conditions as Example 1) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.18 (3H, t, J=8 Hz), 2.20-2.46 (2H, m), 2.66 (2H, q, J=8 Hz), 2.83, 2.93 (total 3H, each s), 3.00-3.68 (4H, m), 3.75-3.95 (1H, m), 7.35-7.45 (2H, m), 7.55-7.72 (3H, m), 7.85 (2H, d, J=8 Hz), 8.00-8.17 (3H, m), 9.03-9.22 (2H, m), 9.37 (2H, s) The chemical structures of the compounds obtained in Examples 93 to 97 are as follows. Example 93 Example 94 Example 95 Example 98 Synthesis of (2S)-2-benzenesulfonylamino-3-(3-(4-(N-methylamidino)benzoylamino)propanoylamino)propanoic acid TFA salt (1) (2S)-2-Benzenesulfonylamino-3-(3-(4-cyanobenzoylamino)propanoylamino)propanoic acid ethyl ester (2S)-2-Benzenesulfonylamino-3-(3-(t-butoxycarbonylamino)propanoylamino)propanoic acid ethyl ester, which is prepared in the same manner as in Example 1-(4), -(5) by using the compound obtained in Example 54-(3), and 4-cyanobenzoic acid are condensed in the same manner as in Example 1-(4) to give the title compound (735 mg) as a white powder. (2) (2S)-2-Benzenesulfonylamino-3-(3-(4-(N-methylamidino)benzoylamino)propanoylamino)propanoic acid TFA salt The compound (208 mg) obtained in the above (1) is treated in the same manner as in Example 19-(2) by using methylamine acetate instead of ammonium acetate to give the title compound (29 mg). MS (SIMS): 476 [M+1] + HPLC retention time: 15.6 min. (under the same conditions as Example 1) 1 H-NMR (DMSO-d 6 ) δ (ppm): 2.23-2.36 (2H, m), 3.01 (3H, d, J=5 Hz), 3.06-3.19 (1H, m), 3.24-3.50 (4H, m), 7.51-7.65 (3H, m), 7.73-7.87 (4H, m), 7.97-8.08 (3H, m), 8.15 (1H, d, J=9 Hz), 8.70 (1H, t, J=5 Hz), 9.04 (1H, s), 9.54 (1H, s), 10.30 (1H, s) Example 99 Synthesis of (2S)-2-benzenesulfonylamino-3-(3-(4-(N-ethylamidino)benzoylamino)propanoylamino)propanoic acid TFA salt The title compound is prepared in the same manner as in Example 98 by using ethylamine acetate. Yield: 33 mg MS (SIMS): 490 [M+1] + HPLC retention time: 16.9 min. (under the same conditions as Example 1) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.25 (3H, t, J=7 Hz), 2.25-2.37 (2H, m), 3.05-3.45 (6H, m), 3.80-3.90 (1H, m), 7.51-7.67 (3H, m), 7.74-7.87 (5H, m), 7.95-8.10 (4H, m), 8.72 (1H, t, J=4 Hz), 9.05, 9.49, 9.81 (total 3H, each s) Example 100 Synthesis of (2S)-2-benzenesulfonylamino-3-(3-(4-(N,N-dimethylamidino)benzoylamino)propanoylamino)propanoic acid TFA salt The title compound is prepared in the same manner as in Example 98 by using dimethylamine acetate. Yield: 31 mg MS (SIMS): 490 [M+1] + HPLC retention time: 16.6 min. (under the same conditions as Example 1) 1 H-NMR (DMSO-d 6 ) δ (ppm): 2.20-2.37 (2H, m), 2.95 (3H, s), 3.05-3.20 (2H, m), 3.22 (3H, s), 3.25-3.55 (2H, m), 3.85-3.98 (1H, m), 7.50-7.81 (7H, m), 7.95-8.19 (4H, m), 8.66 (1H, t, J=4 Hz), 8.99 (1H, s), 9.36 (1H, s) Example 101 Synthesis of (2S)-2-benzenesulfonylamino-3-(3-(4-hydrazinoiminobenzoylamino)propanoylamino)propanoic acid TFA salt The title compound is prepared in the same manner as in Example 98 by using a solution of hydrazine acetate in methanol. Yield: 17 mg MS (SIMS): 477 [M+1] + HPLC retention time: 14.4 min. (under the same conditions as Example 1) 1 H-NMR (DMSO-d 6 ) δ (ppm): 2.21-2.37 (2H, m), 3.05-3.50 (4H, m), 3.84-3.95 (1H, m), 7.50-8.20 (12H, m), 8.55-8.79 (2H, m), 9.82 (1H, m) Example 102 Synthesis of (2S)-2-benzenesulfonylamino-3-(3-(4-acetylhydrazinoiminobenzoylamino)propanoylamino)propanoic acid TFA salt The title compound is prepared in the same manner as in Example 98 by using a solution of hydrazine acetate in methanol. Yield: 49 mg MS (SIMS): 519 [M+1] + HPLC retention time: 13.6 min. (under the same conditions as Example 1) 1 H-NMR (DMSO-d 6 ) δ (ppm): 2.02 (3H, s), 2.22-2.38 (2H, m), 3.03-3.50 (4H, m), 3.84-3.98 (1H, m), 7.50-7.66 (3H, m), 7.74-7.94 (4H, m), 7.97-8.09 (3H, m), 8.15 (1H, d, J=9 Hz), 8.74 (2H, m), 9.83 (2H, s), 10.75 (1H, s) Example 103 Synthesis of (2S)-2-benzenesulfonylamino-3-(3-(4-(N-n-butylamidino)benzoylamino)propanoylamino)propanoic acid TFA salt The title compound is prepared in the same manner as in Example 98 by using n-butylamine acetate. Yield: 16 mg MS (SIMS): 518 [M+1] + HPLC retention time: 22.2 min. (under the same conditions as Example 1) 1 H-NMR (DMSO-d 6 ) δ (ppm): 0.93 (3H, t, J=7 Hz), 1.31-1.47 (2H, m), 1.57-1.70 (2H, m), 2.22-2.37 (2H, m), 3.04-3.50 (6H, m), 3.84-3.95 (1H, m), 7.50-7.65 (3H, m), 7.77 (2H, d, J=6 Hz), 7.80 (2H, d, J=8 Hz), 7.97-8.07 (3H, m), 8,15 (1H, d, J=9 Hz), 8.69 (1H, m), 9.06 (1H, s), 9.49 (1H, s), 9.80 (1H, s) Example 104 Synthesis of (2S)-2-benzenesulfonylamino-3-(3-(4-(N-n-hexylamidino)benzoylamino)propanoylamino)propanoic acid TFA salt The title compound is prepared in the same manner as in Example 98 by using n-hexylamine acetate. Yield: 27 mg MS (SIMS): 546 [M+1] + HPLC retention time: 30.8 min. (under the same conditions as Example 1) 1 H-NMR (DMSO-d 6 ) δ (ppm): 0.88 (3H, t, J=6 Hz), 1.20-1.43 (6H, m), 1.58-1.70 (2H, m), 2.24-2.37 (2H, m), 3.05-3.55 (6H, m), 3.85-3.96 (1H, m), 7.50-7.67 (3H, m), 7.73-7.85 (4H, m), 7.95-8.08 (3H, m), 8.15 (1H, d, J=9 Hz), 8.70 (1H, t, J=5.5 Hz), 9.07 (1H, s), 9.49 (1H, s), 9.81 (1H, s) Example 105 Synthesis of (2S)-2-benzenesulfonylamino-3-(3-(4-(N-cyclohexylamidino)benzoylamino)propanoylamino)propanoic acid TFA salt The title compound is prepared in the same manner as in Example 98 by using cyclohexylamine acetate. Yield: 10 mg MS (SIMS): 544 [M+1] + HPLC retention time: 24.9 min. (under the same conditions as Example 1) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.10-1.43 (5H, m), 1.59-2.03 (5H, m), 2.22-2.35 (2H, m), 3.10-3.84 (6H, m), 6.55 (1H, s), 7.50-7.65 (3H, m), 7.73-7.80 (4H, m), 7.95-8.07 (4H, m), 8.73 (1H, t, J=5 Hz), 9.10 (1H, s), 9.43 (1H, s), 9.60 (1H, m) Example 106 Synthesis of (2S)-2-benzenesulfonylamino-3-(3-(4-(N-benzylamidino)benzoylamino)propanoylamino)propanoic acid TFA salt The title compound is prepared in the same manner as in Example 98 by using benzylamine acetate. Yield: 66.5 mg MS (SIMS): 552 [M+1] + HPLC retention time: 25.1 min. (under the same conditions as Example 1) 1 H-NMR (DMSO-d 6 ) δ (ppm): 2.25-2.40 (2H, m), 3.05-3.20 (1H, m), 3.28-3.68 (3H, m), 3.85-3.99 (1H, m), 4.68 (2H, d, J=6 Hz), 7.32-7.48 (5H, m), 7.51-7.65 (3H, m), 7.77 (2H, d, J=8 Hz), 7.86 (2H, d, J=8 Hz), 8.02 (2H, d, J=8 Hz), 7.99-8.07 (1H, m), 8.15 (1H, d, J=9 Hz), 8.70 (1H, t, J=5 Hz), 9.28 (1H, s), 9.66 (1H, s), 10.33 (1H, t, J=5 Hz) The chemical structures of the compounds obtained in Examples 98 to 106 and 117 are as follows. Example 107 Synthesis of (2S)-2-benzenesulfonylamino-3-(4-(4-(N-methylamidino)phenoxy)butanoylamino)propanoic acid TFA salt (1) 4-(4-(N-Methylamidino)phenoxy)butanoic acid hydrochloride The compound (650 mg) obtained in Example 56-(1) is dissolved in a mixture of pyridine (12.5 ml) and triethylamine (2.5 ml), and to the mixture is blown hydrogen sulfide gas for one hour at room temperature, and the mixture is stirred at room temperature for 22 hours. The hydrogen sulfide gas is removed by blowing nitrogen gas into the reaction mixture, and the mixture is concentrated under reduced pressure. The residue is dissolved in acetone (25 ml), and thereto is added methyl iodide (1.04 ml), and the mixture is stirred at 50°C for 30 minutes. After cooling, the reaction mixture is concentrated under reduced pressure. The residue is dissolved in methanol (10 ml), and thereto is added methylamine acetate (849 mg). The mixture is refluxed at 70°C for one hour, and after cooling, the reaction mixture is concentrated under reduced pressure. To the mixture is added ether, and the supernatant is removed, and the resultant is concentrated to dryness under reduced pressure. To the residue is added a mixture of 1N hydrochloric acid (5 ml) and acetic acid (5 ml), and the mixture is heated with stirring at 50-60°C for 8 hours. The reaction mixture is concentrated under reduced pressure, and acetone is added to the residue. The precipitates are collected by filtration, dissolved in 4N hydrochloric acid in dioxane (10 ml), and the mixture is stirred at room temperature for 30 minutes. The reaction mixture is concentrated under reduced pressure, and to the residue is added acetone. The precipitates are collected by filtration, and dried to give the title compound (587 mg) as a white powder. (2) (2S)-2-Benzenesulfonylamino-3-(4-(4-(N-methylaminoamidino)phenoxy)butanoylamino)propanoic acid TFA salt The compound (683 mg) obtained in Example 54-(4) and the compound (500 mg) obtained in the above (1) are treated in the same manner as in Example 56-(5) to give the title compound (22 mg). MS (SIMS): 463 [M+1] + HPLC retention time: 20.5 min. (under the same conditions as Example 1) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.80-1.98 (2H, m), 2.07-2.23 (2H, m), 2.97 (3H, d, J=5 Hz), 3.03-3.17 (2H, m), 3.82-3.96 (1H, m), 4.00-4.12 (2H, m), 7.14 (2H, d, J=9 Hz), 7.50-8.22 (9H, m), 8.76 (1H, s), 9.28 (1H, s), 9.56 (1H, s) Example 108 Synthesis of (2S)-2-benzenesulfonylamino-3-(4-(4-(N-ethylamidino)phenoxy)butanoylamino)propanoic acid TFA salt (1) (4-(4-(N-Ethylamidino)phenoxy)butanoic acid hydrochloride The title compound is prepared in the same manner as in Example 107-(1) by using ethylamine acetate instead of methylamine acetate. Yield: 597 mg (2) (2S)-2-Benzenesulfonylamino-3-4-(4-(N-ethylamidino)phenoxy)butanoylamino)propanoic acid TFA salt The title compound is prepared in the same manner as in Example 107-(2). Yield: 33 mg MS (SIMS): 477 [M+1] + HPLC retention time: 22.7 min. (under the same conditions as Example 1) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.23 (3H, t, J=7 Hz), 1.84-1.95 (2H, m), 2.10-2.20 (2H, m), 3.02-3.18 (1H, m), 3.28-3.47 (3H, m), 3.85-3.90 (1H, m), 4.00-4.10 (2H, m), 7.14 (2H, d, J=9 Hz), 7.50-7.65 (3H, m), 7.66-7.80 (4H, m), 7.99 (1H, t, J=5.3 Hz), 8.15 (1H, d, J=7 Hz), 8.78 (1H, s), 9.23 (1H, s), 9.52 (1H, s) Example 109 Synthesis of (2S)-2-benzenesulfonylamino-3-(4-(4-(N-benzyloxycarbonylamidino)phenoxy)butanoylamino)propanoic acid TFA salt (1) (2S)-3-(4-(4-Amidinophenoxy)butanoylamino)-2-benzenesulfonylaminopropanoic acid TFA salt The compound obtained in Example 54-(4) is treated in the same manner as in Example 58, and the resultant is purified by HPLC without hydrolysis of ester to give the title compound. (2) (2S)-2-Benzenesulfonylamino-3-(4-(4-(N-benzyloxycarbonylamidino)phenoxy)butanoylamino)propanoic acid TFA salt To a solution of the compound (51 mg) obtained in the above (1) in DMF (2 ml) are added N-(benzyloxycarbonyloxy)succinimide (25 mg) and triethylamine (14 µl), and the mixture is allowed to stand at room temperature for one day. The reaction mixture is concentrated under reduced pressure, and the residue is purified by HPLC, and the fractions containing the title compound are concentrated under reduced pressure. To the residue is added a mixture of 1N hydrochloric acid (2 ml) and acetic acid (2 ml), and the mixture is stirred at 50°C for 13 hours. The reaction mixture is concentrated under reduced pressure, and the resultant is purified by HPLC to give the title compound (3 mg) as a white powder. MS (SIMS): 583 [M+1] + HPLC retention time: 21.0 min. (Column: YMC-ODS 4.6 mmØ x 250 mm, Detection: UV 220 nm, Eluent; A solution; 0.1 % TFA/water, B solution; 0.1 % TFA/acetonitrile, Flow rate: 1 ml/min., Gradient: The concentration of the B solution is increased from 10 % at a rate of 3 %/min.) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.80-2.00 (2H, m), 2.05-2.25 (2H, m), 3.00-3.60 (2H, m), 3.80-4.00 (1H, m), 4.05 (2H, t, J=6.6 Hz), 5.31 (2H, s), 7.11 (2H, d, J=9.2 Hz), 7.30-7.65 (8H, m), 7.70-7.90 (4H, m), 7.97 (1H, bt, J=6 Hz), 8.14 (1H, d, J=8.9 Hz) Example 110 Synthesis of (2S)-2-benzenesulfonylamino-3-(4-(4-(N-(9-fluorenyl)methoxycarbonylamidino)phenoxy)butanoylamino)propanoic acid TFA salt The compound obtained in Example 109-(1) and N-((9-fluorenyl)methoxycarbonyloxy)succinimide are treated in the same manner as in Example 109-(2) to give the title compound. Yield: 5 mg MS (SIMS): 671 [M+1] + HPLC retention time: 22.3 min. (under the same conditions as Example 109) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.80-2.00 (2H, m), 2.10-2.25 (2H, m), 3.00-3.40 (2H, m), 3.80-3.95 (1H, m), 4.06 (2H, t, J=6.6 Hz), 4.38 (1H, t, J=7 Hz), 4.59 (2H, d, J=7 Hz), 7.14 (2H, d, J=8.9 Hz), 7.30-7.65 (7H, m), 7.70-7.95 (8H, m), 7.99 (1H, t, J=6 Hz), 8.15 (1H, d, J=9.2 Hz) Example 111 Synthesis of (2S)-2-benzenesulfonylamino-3-(4-(6-(1-imino-1,2,3,4-tetrahydroisoquinolyl)oxy)butanoylamino)propanoic acid TFA salt (1) 6-Methoxy-1-oxo-1,2,3,4-tetrahydroisoquinoline To a solution of 5-methoxy-1-indanone (1.0 g) in TFA (20 ml) is added sodium azide (4.0 g), and the mixture is refluxed for 1.5 hour. After cooling, the reaction mixture is poured into water (100 ml), and the pH value of the mixture is adjusted to pH 7 with sodium hydrogen carbonate. The mixture is extracted with ethyl acetate, and washed with a saturated aqueous sodium hydrogen carbonate solution and a saturated brine, and dried over magnesium sulfate. The desiccant is removed by filtration, and the filtrate is concentrated under reduced pressure. The residue is purified by silica gel column chromatography (silica gel; 100 g, chloroform/methanol = 20:1). The fractions containing the title compound are concentrated under reduced pressure to give the title compound (470 mg) as a pale brown powder. 1 H-NMR (CDCl 3 ) δ (ppm): 2.97 (2H, t, J=6.5 Hz), 5.35 (2H, ddd, J=2.9, 6.5, 6.5 Hz), 3.85 (3H, s), 6.38 (1H, s), 6.71 (1H, d, J=2.6 Hz), 6.86 (1H, dd, J=2.6, 8.5 Hz), 8.02 (1H, d, J=8.5 Hz) (2) 1-Oxo-1,2,3,4-tetrahydroisoquinolin-6-ol To a solution of aluminum chloride (300 mg) and octanethiol (392 µl) in methylene chloride (5 ml) is added dropwise a solution of the compound (200 mg) obtained in the above (1) in methylene chloride (10 ml), and the mixture is stirred at room temperature for five hours. The reaction mixture is concentrated under reduced pressure, and the residue is purified by silica gel column chromatography (silica gel; 70 g, chloroform/methanol = 10:1 → 5:1). The fractions containing the title compound are concentrated under reduced pressure to give the title compound (110 mg) as a pale brown powder. 1 H-NMR (CDCl 3 ) δ (ppm): 2.87 (2H, t, J=6.5 Hz), 3.46 (2H, ddd, J=2.5, 6.5, 6.5 Hz), 6.64 (1H, d, J=2.5 Hz), 6.73 (1H, dd, J=2, 8.5 Hz), 7.05 (1H, bs), 7.81 (1H, d, J=8.5 Hz), 9.59 (1H, s) (3) 4-(6-(1-Oxo-1,2,3,4-tetrahydroisoquinolyl)oxy)butanoic acid ethyl ester To a solution of the compound (110 mg) obtained in the above (2) in DMF (5 ml) are added 4-bromobutanoic acid ethyl ester (132 mg) and potassium carbonate (102 mg), and the mixture is stirred at room temperature for 24 hours. The reaction mixture is poured into water, and extracted with ethyl acetate. The extract is washed successively with a saturated aqueous sodium hydrogen carbonate solution and a saturated brine, and dried over magnesium sulfate. The filtrate is concentrated under reduced pressure to give the title compound (181 mg). 1 H-NMR (CDCl 3 ) δ (ppm): 1.26 (3H, t, J=7 Hz), 2.13 (2H, tt, J=7 Hz), 2.52 (2H, t, J=7 Hz), 2.96 (2H, t, J=6.3 Hz), 3.49-3.63 (2H, m), 4.06 (2H, t, J=7 Hz), 4.15 (2H, q, J=7 Hz), 6.08 (1H, bs), 6.70 (1H, s), 6.84 (1H, d, J=8.6 Hz), 8.01 (1H, d, J=8.6 Hz) (4) 4-(6-(1-Imino-1,2,3,4-tetrahydroisoquinolyl)oxy)butanoic acid TFA salt To a solution of the compound (177 mg) obtained in the above (3) in tetrahydrofuran (5 ml) is added a Lawesson's reagent (Tetrahedron Lett., 21 , 4061 (1980), 309 mg), and the mixture is stirred at 40-50°C for 20 minutes. The reaction mixture is concentrated under reduced pressure, and the residue is purified by silica gel column chromatography (silica gel; 50 g, chloroform/methanol = 20:1). The fractions containing the title compound are concentrated under reduced pressure. To the residue are added acetone (20 ml) and methyl iodide (238 µl), and the mixture is stirred at 50°C for one hour. After cooling, the reaction mixture is concentrated under reduced pressure. To the residue are added methanol (20 ml) and ammonium acetate (148 mg), and the mixture is stirred at 70°C for one hour. After cooling, the mixture is concentrated under reduced pressure. To the residue is added a mixture of 1N hydrochloric acid (20 ml) and acetic acid (20 ml), and the mixture is stirred at 60°C for 4.5 hours. The mixture is concentrated under reduced pressure, and the resultant is purified by HPLC to give the title compound (88 mg) as a pale brown powder. 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.96 (2H, t, J=7 Hz), 2.39 (2H, t, J=7 Hz), 2.95 (2H, t, J=7 Hz), 3.47 (2H, m), 4.05-4.20 (2H, m), 7.00-7.10 (2H, m), 7.95 (1H, d, J=9 Hz), 8.70 (1H, s), 8.98 (1H, s), 9.53 (1H, s) (5) (2S)-2-Benzenesulfonylamino-3-(4-(6-(1-imino-1,2,3,4-tetrahydroisoquinolyl)oxy)butanoylamino)propanoic acid TFA salt The compound (95 mg) obtained in Example 54-(4) and the compound (88 mg) obtained in the above (4) are treated in the same manner as in Example 77 to give the title compound (4 mg). MS (SIMS): 475 [M+1] + HPLC retention time: 22.3 min. (under the same conditions as Example 1) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.85-1.95 (2H, m), 2.10-2.20 (2H, m), 2.95 (2H, t, J=6.5 Hz), 3.03-3.16 (1H, m), 3.42-3.52 (3H, m), 3.82-3.92 (1H, m), 4.06 (2H, t, J=7 Hz), 7.02-7.085 (2H, m), 7.50-7.65 (3H, m), 7.77 (2H, d, J=7 Hz), 8.12 (1H, d, J=7 Hz), 8.58 (1H, s), 8.97 (1H, s), 9.36 (1H, s) The chemical structures of the compounds obtained in Examples 107 to 111 are as follows. Example 111 Example 112 Synthesis of (2S)-3-(4-(4-amidinophenoxy)butanoylamino)-2-benzenesulfonylaminopropanoic acid 5-indanol ester TFA salt (1) (2S)-2-Benzyloxycarbonylamino-3-(t-butoxycarbonylamino)propanoic acid 5-indanol ester To a solution of the compound (480 mg) obtained in Example 1-(2) in methylene chloride (10 ml) are added 5-indanol (209 mg), 4-dimethylaminopyridine (8 mg) and HOBT·H 2 O (239 mg). To the mixture is added WSC·HCl (273 mg) at 5-10°C, and the mixture is stirred for 30 minutes, and further stirred at room temperature for two hours. The reaction solution is diluted with ethyl acetate, and washed successively with water and a saturated brine, and dried over magnesium sulfate. The desiccant is removed by filtration, and the filtrate is concentrated under reduced pressure. The resultant is purified by silica gel column chromatography (silica gel; 50 g, n-hexane/ethyl acetate = 3:1) to give the title compound (498 mg). 1 H-NMR (CDCl 3 ) δ (ppm): 1.43 (9H, s), 2.09 (2H, quint, J=7.6 Hz), 2.80-3.00 (4H, m), 3.60-3.90 (2H, m), 4.55-4.70 (1H, m), 4.91 (1H, bs), 5.14 (2H, s), 5.85-5.90 (1H, m), 6.85 (1H, bd, J=7.3 Hz), 6.96 (1H, bs), 7.18 (1H, d, J=8.3 Hz), 7.30-7.45 (5H, m) (2) (2S)-2-Benzenesulfonylamino-3-(t-butoxycarbonylamino)propanoic acid 5-indanol ester To a solution of the compound (498 mg) obtained in the above (1) in THF (10 ml) are added 10 % palladium-carbon (50 % wet, 500 mg) and acetic acid (0.07 ml), and the mixture is stirred at room temperature under hydrogen atmosphere for six hours. The insoluble materials are removed by filtration, and to the filtrate are added benzenesulfonyl chloride (212 mg) and triethylamine (0.32 ml), and the mixture is stirred for 12 hours. The reaction solution is diluted with ethyl acetate, and washed with water. The organic layer is concentrated, and the residue is purified by silica gel column chromatography (silica gel; 20 g, n-hexane/ethyl acetate = 2:1). The fractions containing the title compound are concentrated under reduced pressure to give the title compound (120 mg). 1 H-NMR (CDCl 3 ) δ (ppm): 1.44 (9H, s), 2.06 (2H, quint, J=7.6 Hz), 2.84 (4H, t, J=7.6 Hz), 3.55-3.85 (2H, m), 4.15-4.30 (1H, m), 4.99 (1H, bs), 5.73 (1H, bd, J=7.9 Hz), 6.58 (1H, dd, J=7.9, 2.0 Hz), 6.70 (1H, bs), 7.11 (2H, d, J=7.9 Hz), 7.50-7.75 (3H, m), 7.85-7.95 (2H, m) (3) (2S)-3-(4-(4-Amidinophenoxy)butanoylamino)-2-benzenesulfonylaminopropanoic acid 5-indanol ester TFA salt The compound (100 mg) obtained in the above (2) is treated in the same manner as in Example 109-(1) to give the title compound (54 mg). MS (SIMS): 565 [M+1] + HPLC retention time: 41.7 min. (under the same conditions as Example 1) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.80-2.10 (4H, m), 2.15-2.30 (2H, m), 2.78 (4H, t, J=7 Hz), 3.20-3.60 (2H, m), 4.03 (2H, t, J=6.6 Hz), 4.15-4.25 (1H, m), 6.50-6.65 (2H, m), 7.08 (2H, d, J=8.9 Hz), 7.13 (1H, d, J=8.3 Hz), 7.50-7.70 (3H, m), 7.70-7.90 (4H, m), 8.20 (1H, bt, J=6.0 Hz), 8.60 (1H, d, J=8.9 Hz), 8.79 (2H, bs), 9.12 (2H, bs) Example 113 Synthesis of (2S)-3-(4-(4-amidinophenoxy)butanoylamino)-2-benzenesulfonylaminopropanoic acid pivaloyloxymethyl ester TFA salt (1) (2S)-2-Benzyloxycarbonylamino-3-(t-butoxycarbonylamino)propanoic acid pivaloyloxymethyl ester To a solution of the compound (200 mg) obtained in Example 1-(2) in DMF (5 ml) are added pivalic acid chloromethyl ester (107 mg) and potassium carbonate (81 mg), and the mixture is stirred at room temperature for 24 hours. The reaction solution is diluted with ethyl acetate, washed with water, and the organic layer is concentrated under reduced pressure. The residue is purified by silica gel column chromatography (silica gel; 50 g, n-hexane/ethyl acetate = 2:1) to give the title compound (188 mg). 1 H-NMR (CDCl 3 ) δ (ppm): 1.22 (9H, s), 1.42 (9H, s), 3.40-3.70 (2H, m), 4.35-4.50 (1H, m), 4.84 (1H, bs), 5.12 (2H, s), 5.73, 5.85 (2H, ABq, J=5.6 Hz), 5.80-6.00 (1H, m), 7.25-7.45 (2H, m) (2) (2S)-2-Benzenesulfonylamino-3-(t-butoxycarbonylamino)propanoic acid pivaloyloxymethyl ester The compound obtained in the above (1) is treated in the same manner as in Example 112-(2) to give the title compound (100 mg). 1 H-NMR (CDCl 3 ) δ (ppm): 1.17 (9H, s), 1.42 (9H, s), 3.40-3.55 (2H, m), 4.00-4.15 (1H, m), 4.90 (1H, bs), 5.60, 5.64 (2H, ABq, J=6 Hz), 5.75 (1H, bd, J=7.6 Hz), 7.45-7.65 (3H, m), 7.80-7.90 (2H, m) (3) (2S)-3-(4-(4-Amidinophenoxy)butanoylamino)-2-benzenesulfonyl-aminopropanoic acid pivaloyloxymethyl ester The compound (77 mg) obtained in the above (2) is treated in the same manner as in Example 112-(3) to give the title compound (72 mg). MS (SIMS): 563 [M+1] + HPLC retention time: 36.8 min. (under the same conditions as Example 1) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.11 (9H, s), 1.80-1.95 (2H, m), 2.05-2.20 (2H, m), 3.00-3.50 (2H, m), 3.95-4.10 (3H, m), 5.52 (2H, s), 7.13 (2H, d, J=9.2 Hz), 7.50-7.70 (3H, m), 7.70-7.90 (4H, m), 8.01 (1H, bt, J=6 Hz), 8.46 (1H, d, J=8.6 Hz), 8.80 (2H, bs), 9.12 (2H, bs) Example 114 Synthesis of (2S)-2-(2-amino)benzenesulfonylamino-3-(3-(4-carbamoylbenzoylamino)propanoylamino)propanoic acid TFA salt (1) (2S)-3-(t-Butoxycarbonylamino)-2-(2-nitro)benzenesulfonylaminopropanoic acid ethyl ester The compound obtained in Example 54-(3) is treated in the same manner as in Example 54-(4) by using 2-nitrobenzenesulfonyl chloride to give the title compound. (2) (2S)-2-(2-Amino)benzenesulfonylamino-3-(3-(4-carbamoylbenzoylamino)propanoylamino)propanoic acid TFA salt The title compound is prepared in the same manner as in Example 19. Yield: 177 mg MS (SIMS): 478 [M+1] + HPLC retention time: 9.2 min. (under the same conditions as Example 1) 1 H-NMR (DMSO-d 6 ) δ (ppm): 2.25-2.38 (2H, m), 3.03-3.50 (4H, m), 3.76 (1H, bs), 5.89 (2H, bs), 6.58 (1H, t, J=7 Hz), 6.78 (1H, d, J=9 Hz), 7.19-7.29 (1H, m), 7.40-7.54 (2H, m), 7.80-7.99 (6H, m), 8.07 (1H, s), 8.55 (1H, t, J=5 Hz) Example 115 Synthesis of (2S)-3-(3-(4-Amidinobenzoylamino)propanoylamino)-2-(4-ethyl)benzenesulfonylaminopropanoic acid 5-indanol ester TFA salt (1) (2S)-2-Benzyloxycarbonylamino-3-(3-(t-butoxycarbonylamino)propanoylamino)propanoic acid 5-indanol ester The compound (2.0 g) obtained in Example 1-(4) is dissolved in a mixture of THF (8 ml) and methanol (8 ml), and thereto is added an aqueous lithium hydroxide solution (LiOH; 546 mg, water; 8 ml), and the mixture is stirred at room temperature for one hour. The mixture is evaporated under reduced pressure to remove the solvent, and the pH value of the resultant is adjusted to pH 1 with 1N hydrochloric acid, and extracted with ethyl acetate. The extract is evaporated under reduced pressure to remove the solvent to give a carboxylic acid compound (1.96 g). The carboxylic acid compound (500 mg) thus obtained and 5-indanol are treated in the same manner as in Example 112-(1) to give the title compound (0.64 g). (2) (2S)-2-(4-Ethyl)benzenesulfonylamino-3-(3-(t-butoxycarbonylamino)propanoylamino)propanoic acid 5-indanol ester The compound (640 mg) obtained in the above (1) is treated in the same manner as in Example 112-(2) to give the title compound (148 mg). 1 H-NMR (CDCl 3 ) δ (ppm): 1.26 (3H, t, J=7.6 Hz), 1.44 (9H, s), 2.00-2.15 (2H, m), 2.41 (2H, t, J=5.9 Hz), 2.73 (2H, q, J=7.6 Hz), 2.84 (4H, t, J=7 Hz), 3.30-3.45 (2H, m), 3.65-3.90 (2H, m), 4.15-4.30 (1H, m), 5.10-5.30 (1H, m), 5.75-5.90 (1H, m), 6.40 (1H, bs), 6.56 (1H, dd, J=2, 8 Hz), 6.65 (1H, d, J=2 Hz), 7.11 (1H, d, J=8 Hz), 7.34 (2H, d, J=8 Hz), 7.80 (2H, d, J=8 Hz) (3) (2S)-3-(3-(4-Amidinobenzoylamino)propanoylamino)-2-(4-ethyl)benzenesulfonylaminopropanoic acid 5-indanol ester TFA salt The compound (148 mg) obtained in the above (2) is treated in the same manner as in Example 22 to give the title compound (84 mg). MS (SIMS): 606 [M+1] + HPLC retention time: 41.9 min. (under the same conditions as Example 1) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.18 (3H, t, J=8 Hz), 1.90-2.10 (2H, m), 2.37 (2H, t, J=7 Hz), 2.68 (2H, q, J=8 Hz), 2.78 (4H, t, J=7 Hz), 3.30-3.60 (4H, m), 4.10-4.25 (1H, m), 6.51 (1H, dd, J=2, 8 Hz), 6.58 (1H, d, J=2 Hz), 7.12 (1H, d, J=8 Hz), 7.43 (2H, d, J=8 Hz), 7.73 (2H, d, J=8 Hz), 7.86 (2H, d, J=9 Hz), 7.98 (2H, d, J=9 Hz), 8.26 (1H, t, J=6 Hz), 8.52 (1H, d, J=9.2 Hz), 8.72 (1H, t; J=6 Hz), 9.31 (2H, bs), 9.40 (2H, bs) Example 116 Synthesis of (2S)-3-(3-(4-amidinobenzoylamino)propanoylamino)-2-(4-ethyl)benzenesulfonylaminopropanoic acid pivaloyloxymethyl ester TFA salt (1) (2S)-2-(4-Ethyl)benzenesulfonylamino-3-(t-butoxycarbonylamino)propanoic acid pivaloyloxymethyl ester The compound (310 mg) obtained in Example 113-(1) is treated in the same manner as in Example 112-(2) to give the title compound (65 mg). 1 H-NMR (CDCl 3 ) δ (ppm): 1.17 (9H, s), 1.25 (3H, t, J=7.6 Hz), 1.42 (9H, s), 2.71 (2H, q, J=7.6 Hz), 3.40-3.50 (2H, m), 4.00-4.10 (1H, m), 4.85-5.00 (1H, m), 5.60, 5.64 (2H, ABq, J=5 Hz), 5.65-5.80 (1H, m), 7.32 (2H, d, J=8 Hz), 7.75 (2H, d, J=8 Hz) (2) (2S)-2-(4-Ethyl)benzensulfonylamino-3-(3-(t-butoxycarbonylamino)propanoylamino)propanoic acid pivaloyloxymethyl ester The compound (65 mg) obtained in the above (1) is treated in the same manner as in Example 1-(4) to give the title compound (65 mg). 1 H-NMR (CDCl 3 ) δ (ppm): 1.17 (9H, s), 1.25 (3H, t, J=7.6 Hz), 1.44 (9H, s), 2.30-2.45 (2H, m), 2.71 (2H, q, J=7.6 Hz), 3.30-3.45 (2H, m), 3.45-3.60 (2H, m), 4.00-4.15 (1H, m), 5.15-5.30 (1H, m), 5.58, 5.67 (2H, ABq, J=5.3 Hz), 6.05-6.20 (1H, m), 6.50-6.65 (1H, m), 7.32 (2H, d, J=8.6 Hz), 7.75 (2H, d, J=8.6 Hz) (3) (2S)-3-(3-(4-Amidinobenzoylamino)propanoylamino)-2-(4-ethyl)benzenesulfonylaminopropanoic acid pivaloyloxymethyl ester TFA salt The compound (65 mg) obtained in the above (2) is treated in the same manner as in Example 22 to give the title compound (10 mg). MS (SIMS): 604 [M+1] + HPLC retention time: 38.7 min. (under the same conditions as Example 1) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.11 (9H, s), 1.18 (3H, t, J=7.6 Hz), 2.20-2.35 (2H, m), 2.67 (2H, q, J=7.6 Hz), 3.05-3.20 (1H, m), 3.20-3.50 (3H, m), 3.90-4.05 (1H, m), 5.53 (2H, s), 7.40 (2H, d, J=8 Hz), 7.66 (2H, d, J=8 Hz), 7.87 (2H, d, J=8 Hz), 8.01 (2H, d, J=8 Hz), 8.04 (1H, bt, J=5.6 Hz), 8.36. (1H, d, J=8.6 Hz), 8.71 (1H, bt, J=5.6 Hz), 9.11 (2H, bs), 9.39 (2H, bs) The chemical structures of the compounds obtained in Examples 112 to 116 are as follows. Example 114 Example 117 Synthesis of (2S)-3-(3-(4-benzyloxycarbonylamidino)propanoylamino)-2-(4-ethyl)benzenesulfonylaminopropanoic acid TFA salt To a solution of the compound (100 mg) obtained in Example 79 in DMF (1 ml) are added N-(benzyloxycarbonyloxy)succinimide (40 mg) and triethylamine (27 µl), and the mixture is allowed to stand at room temperature for one day. The reaction mixture is concentrated under reduced pressure, and the residue is purified by HPLC, and the fractions containing the title compound are concentrated under reduced pressure. The residue is dissolved in a mixture of THF (2 ml) and methanol (2 ml), and thereto is added an aqueous lithium hydroxide solution (LiOH; 9.6 mg, water; 2 ml), and the mixture is stirred at room temperature for two hours. The mixture is evaporated under reduced pressure, and the pH value of the resultant is adjusted to pH 2 with 1N hydrochloric acid, and then purified by HPLC to give the title compound (15 mg) as a white powder. MS (SIMS): 624 [M+1] + HPLC retention time: 34.7 min. (under the same conditions as Example 1) 1 H-NMR (DMSO-d 6 ) δ (ppm): 1.17 (3H, t, J=7 Hz), 2.20-2.35 (2H, m), 2.66 (2H, q, J=7 Hz), 3.05-3.20 (1H, m), 3.25-3.50 (3H, m), 3.80-4.00 (1H, m), 5.28 (2H, s), 7.35-7.50 (7H, m), 7.67 (2H, d, J=8 Hz), 7.90-8.10 (6H, m), 8.66 (1H, bt, J=5 Hz) Example 118 Platelet aggregation inhibitory activity The compounds of Examples 72 to 116 were tested in the same manner as in Example 17. The test results of the test compounds are shown in Table 3. Test results Test Compound IC 50 (nM) The compound of Example 72 52 The compound of Example 73 162 The compound of Example 74 14 The compound of Example 75 34 The compound of Example 76 17 The compound of Example 77 65 The compound of Example 78 16 The compound of Example 80 17 The compound of Example 81 28 The compound of Example 82 31 The compound of Example 83 30 The compound of Example 84 22 The compound of Example 85 26 The compound of Example 86 56 The compound of Example 93 93 The compound of Example 94 31 The compound of Example 95 15 or 17 The compound of Example 96 57 The compound of Example 97 49 The compound of Example 98 57 The compound of Example 99 17 The compound of Example 100 28 The compound of Example 101 103 The compound of Example 102 35 The compound of Example 103 25 The compound of Example 104 28 The compound of Example 105 22 The compound of Example 106 116 The compound of Example 107 29 The compound of Example 108 51 The compound of Example 111 41 The compound of Example 113 48 The compound of Example 114 35 The compound of Example 116 103 Example 119 Specificity for cell adhesion reaction (1) Preparation of human platelet The blood was taken out from the elbow vein of a normal male volunteer, and mixed with 1/10 volume of 3.8 % sodium citrate. The blood was centrifuged at 1,000 rpm (150 g) for 10 minutes, and the supernatant is collected as a platelet rich plasma (PRP). The precipitates are centrifuged at 11,000 rpm (6000 g) for two minutes, and the supernatant is collected as a platelet poor plasma (PPP). To PRP is added prostaglandin I 2 (PGI 2 ) at a final concentration of 50 ng/ml, and the mixture was centrifuged at 11000 rpm for two minutes to give human platelet. The platelet was activated by washing with 3.8 mM HEPES-buffer (pH 7.4, Tyrode-HEPES buffer) containing 0.14 M sodium chloride, 2.7 mM potassium chloride, 3.7 mM sodium dihydrogen phosphate, 0.98 mM magnesium chloride, 1 mg/ml glucose, 50 ng/ml PGI 2 and 0.35 % bovine serum albumin (BSA), adding thereto 5 µM epinephrine, and 30 µM ADP (adenosine diphosphate), followed by being allowed to stand at room temperature for five minutes. To the activated platelet was added 0.05 % p-formaldehyde, and the mixture was allowed to stand at room temperature for 30 minutes to give the fixed platelet, which was suspended in Tyrode-HEPES buffer to give a platelet suspension of a concentration of 2 x 10 8 ml -1 . (2) Binding assay of platelet to adhesive protein Human fibrinogen from which fibronectin was previously removed by passing through gelatin-cepharose, human fibronectin or human vitronectin was diluted with 0.1 M aqueous sodium hydrogen carbonate solution to a concentration of 5 µg/ml, and the protein solution is put into a 96-well microplate at a volume of 200 µl/well. The microplate was allowed to stand at 4°C overnight. The plate was washed with phosphate buffered saline (PBS), and subjected to blocking with 3 % BSA at 37°C for one hour. To the plate were added a platelet suspension (final concentration, 10 8 ml -1 ) and a test compound of various concentrations (total volume, 200 µl/well), and the plate was incubated at 37°C for 60 minutes. The plate was treated with 1000-fold diluted enzyme (HRP)-labelled anti-mouse IgG polyclonal antibody at 37°C for 60 minutes, and thereto was added HRP chromogenic substrate (0.1 M phosphate buffer containing 0.4 mg/ml O-phenylenediamine, 0.01 % hydrogen peroxide, 0.1 M citric acid, pH 5), and reacted at room temperature for 15 minutes. The reaction was terminated by adding thereto 4.5 M sulfuric acid at a volume of 25 µl/well, and the absorbance at 490 nm was measured. The inhibitory activity (IC 50 ) against the binding between various adhesive proteins and platelet is shown in Table 4. Test results (receptor binding inhibition (IC 50 , M)) Test Compound Fibrinogen Fibronectin Bitronectin The compound of Ex. 1 4.6 x 10 -9 2.0 x 10 -7 1.0 x 10 -6 The compound of Ex. 2 1.2 x 10 -8 1.2 x 10 -7 7.5 x 10 -5 The compound of Ex. 18 7.3 x 10 -9 4.0 x 10 -7 8.9 x 10 -6 The compound of Ex. 19 5.0 x 10 -9 4.7 x 10 -8 1.2 x 10 -6 The compound of Ex. 20 7.3 x 10 -9 7.9 x 10 -8 5.0 x 10 -7 The compound of Ex. 21 2.2 x 10 -9 3.1 x 10 -7 2.4 x 10 -7 The compound of Ex. 57 7.1 x 10 -9 1.2 x 10 -6 7.5 x 10 -6 The compound of Ex. 58 2.4 x 10 -8 6.1 x 10 -7 8.0 x 10 -6 The compound of Ex. 59 1.2 x 10 -8 6.1 x 10 -7 3.3 x 10 -6 The compound of Ex. 60 1.5 x 10 -9 9.4 x 10 -8 1.1 x 10 -6 The compound of Ex. 61 1.0 x 10 -9 2.5 x 10 -8 3.8 x 10 -7 The compound of Ex. 62 1.1 x 10 -9 4.5 x 10 -9 2.4 x 10 -7 The compound of Ex. 63 2.2 x 10 -9 4.1 x 10 -8 1.3 x 10 -7 The compound of Ex. 64 2.4 x 10 -8 2.8 x 10 -7 4.8 x 10 -6 The compound of Ex. 69 9.8 x 10 -9 6.0 x 10 -8 9.7 x 10 -7 The compound of Ex. 74 2.2 x 10 -8 5.4 x 10 -7 3.5 x 10 -6 The compound of Ex. 75 8.1 x 10 -9 1.1 x 10 -7 1.6 x 10 -6 The compound of Ex. 76 6.3 x 10 -9 5.1 x 10 -7 5.4 x 10 -7 The compound of Ex. 77 6.7 x 10 -9 5.4 x 10 -8 6.7 x 10 -7 The compound of Ex. 78 9.0 x 10 -9 2.5 x 10 -8 1.6 x 10 -7 The compound of Ex. 80 1.0 x 10 -8 3.9 x 10 -7 4.9 x 10 -6 The compound of Ex. 82 1.2 x 10 -9 1.9 x 10 -8 2.7 x 10 -7 The compound of Ex. 83 2.2 x 10 -8 7.7 x 10 -7 7.8 x 10 -6 The compound of Ex. 85 4.8 x 10 -9 2.0 x 10 -8 2.7 x 10 -7 The compound of Ex. 86 1.1 x 10 -9 1.2 x 10 -7 5.0 x 10 -7 The compound of Ex. 93 1.5 x 10 -8 9.5 x 10 -8 3.5 x 10 -6 The compound of Ex. 95 8.4 x 10 -9 3.3 x 10 -8 6.3 x 10 -7 Example 120 Platelet Aggregation Inhibitory Activity (ex vivo) Method: A canula for collecting blood was inserted into the left common carotid artery of a guinea pig which was anesthetized with pentobarbital (30 mg/kg, i.p.). The blood (1 ml) was taken with a syringe containing 1/10 volume of 3.8 % sodium citrate (Kettin-citrate, manufactured by Kokusai Shiyaku Ltd.), and the platelet aggregation ability thereof was measured (as a value before administration). Then, a test compound was orally administered to the guinea pig at a dose of 0.1 mg/kg in a volume of 5 ml/kg, and the blood was collected periodically likewise at 0.5, 1, 2, 4 and 6 hours after the administration of the test compound, and the platelet aggregation ability thereof was measured. The determination of the platelet aggregation ability was carried out by turbidimetry using a Hematracer (Niko Bioscience) as follows. That is, the blood was centrifuged at 4500 rpm at room temperature for 10 seconds, and the supernatant was considered as platelet rich plasma (PRP), and the precipitate was centrifuged at 11000 rpm for two minutes and its supernatant was considered as platelet poor plasma (PPP), and the photo-transmittance of the PRP and the PPP was adjusted to 0 %, and 100 %, respectively. A cubet containing PRP (200 µl) was inserted to a measurement well, and centrifuged at 1000 rpm at 37°C for two minutes, and thereto was added a platelet aggregator; ADP (adenosine diphosphate, Sigma Ltd., 20 µl, final concentration; 10 µg/ml), and the maximum aggregation rate was measured. From the maximum aggregation rate before the administration of the test compound (MAR control) and the maximum aggregation rate after the administration of the test compound (MAR sample), the platelet aggregation inhibitory rate of each test compound was estimated according to the following equation. Inhibitory rate (%) = (1 - (MAR sample/MAR control)) x 100 The periodical change in the platelet aggregation inhibitory rate of each test compound at a dose of 0.1 mg/kg of oral administration is shown in Table 5. Test results (platelet aggregation inhibitory rate (%)) Test Compound 0.5 hr 1 hr 2 hrs 4 hrs 6 hrs The Compound of Ex. 1 100 100 100 100 100 The Compound of Ex. 2 87 78 67 32 13 The Compound of Ex. 18 54 100 100 73 66 The Compound of Ex. 19 86 93 91 89 91 The Compound of Ex. 20 76 91 99 100 100 The Compound of Ex. 21 96 99 100 100 100 The Compound of Ex. 61 45 32 25 48 0 The Compound of Ex. 62 63 69 63 56 50 The Compound of Ex. 63 57 48 26 3 0 The Compound of Ex. 64 50 0 0 0 0 The Compound of Ex. 69 69 39 22 6 3 The Compound of Ex. 74 92 100 100 100 100 The Compound of Ex. 75 74 82 100 90 74 The Compound of Ex. 76 100 100 100 100 100 The Compound of Ex. 77 100 100 100 100 97 The Compound of Ex. 78 99 100 100 100 100 The Compound of Ex. 80 100 100 75 79 74 The Compound of Ex. 82 81 66 54 52 51 The Compound of Ex. 83 50 47 48 32 41 The Compound of Ex. 85 36 41 44 31 17 The Compound of Ex. 86 46 0 0 0 0 The Compound of Ex. 93 4 27 69 44 12 The Compound of Ex. 95 49 49 31 12 18 The Compound of Ex. 98 94 100 100 100 100 The Compound of Ex. 99 100 100 100 100 100 The Compound of Ex. 100 100 100 100 100 100 Industrial Applicability 2,3-Diaminopropionic acid derivatives of the present invention are useful as a platelet aggregation inhibitor, a cancer metastasis inhibitor, a wound healing agent or a bone resorption inhibitor.

Claims: A compound of the formula (5): wherein R 1 is a hydrogen atom, a C 1 -C 6 alkyl group, a cycloalkyl group, a C 2 -C 6 alkenyl group, a C 2 -C 6 alkynyl group, an aryl group, a heterocyclic group, a substituted C 1 -C 6 alkyl group, a substituted cycloalkyl group, a substituted C 2 -C 6 alkenyl group, a substituted C 2 -C 6 alkynyl group, a substituted aryl group, or a substituted heterocyclic group; R 2 is a C 1 -C 6 alkyl group, a cycloalkyl group, a C 2 -C 6 alkenyl group, a C 2 -C 6 alkynyl group, an aryl group, a heterocyclic group, a substituted C 1 -C 6 alkyl group, a substituted cycloalkyl group, a substituted C 2 -C 6 alkenyl group, a substituted C 2 -C 6 alkynyl group, a substituted aryl group, or a substituted heterocyclic group; X and A 6 are defined by the following (a) or (b), or a pharmaceutically acceptable salt thereof: (a) X is a group of the formula (2): wherein Y 1 is a methine group or a nitrogen atom, V 1 and V 2 are the same or different and each a hydrogen atom or a C 1 -C 6 alkyl group, provided that both V 1 and V 2 are a substituent on the carbon atom, and A 6 is a divalent group selected from the following groups: Y 4 -(CH 2 ) a -CONR 10 -CH 2 -CHR 9 - (R 9 is a hydrogen atom or a C 1 -C 6 alkyl group, R 10 is a hydrogen atom or a C 1 -C 6 alkyl group, a is 1 or 2, Y 4 is a methylene group or an oxygen atom); Y 4 -(CH 2 ) b - (Y 4 is the same as defined above, and b is 5 or 6); (CH 2 ) c -CO-(CH 2 ) d - (c is 2 or 3, d is 3 or 4); (CH 2 ) c -CH(OH)-(CH 2 ) d - (c and d are the same as defined above); CH 2 -NR 10 CO-(CH 2 ) d - (R 10 and d are the same as defined above); Y 4 -(CH 2 ) e -Y 5 - (Y 4 is the same as defined above, Y 5 is an oxygen atom or -NR 11 - (R 11 is a hydrogen atom or a C 1 -C 6 alkyl group), and e is 4 to 6); a group of the formula: wherein a and c are the same as defined above, (b) X is a group of the formula (3): wherein Y 2 and Y 3 are the same or different and each a methine group or a nitrogen atom, V 3 and V 4 are the same or different and each a hydrogen atom, an alkyl group, a substituted C 1 -C 6 alkyl group, a cycloalkyl group, an amino group, an acylamino group, a C 1 -C 6 alkyloxycarbonyl group or a C 1 -C 6 alkyloxycarbonyl group substituted by an aryl group, V 5 is an imino group or an oxygen atom, V 6 and V 7 are a hydrogen atom or a C 1 -C 6 alkyl group, provided that both V 6 and V 7 are a substituent on the carbon atom, or a group of the formula (4): wherein Y 2 , Y 3 and V 3 are the same as defined above, m is 2 or 3, and A 6 is a divalent group selected from the following groups: (CH 2 ) f -CONR 10 -CH 2 -CHR 9 - (R 9 and R 10 are the same as deined above, and f is 0 or 1); Y 4' -(CH 2 ) d - (Y 4' is an oxygen and d is the same as defined above); (CH) f -CO-(CH 2 ) d - (f and d are the same as defined above); (CH 2 ) f -CH(OH)-(CH 2 ) d - (f and d are the same as defined above); NR 10 CO-(CH 2 ) d - (R 10 and d are the same as defined above); Y 4' -(CH 2 ) g -Y 5 - (Y 4' and Y 5 are the same as defined above, and g is 2 to 4); a group of the formula: wherein a and f are the same as defined above, a group of the formula: wherein f is the same as defined above, Y 6 is a methine group or a nitrogen atom; a group of the formula: wherein Y 5 and f are the same as defined above, and h is 0 or 1; a group of the formula: wherein Y 4' , Y 5 and h are the same as defined above. The compound according to claim 1, wherein X and A 6 are defined by the following (a) or (b), or a pharmaceutically acceptable salt thereof: (a) X is a group of the formula (2): wherein Y 1 , V 1 and V 2 are the same as defined above, and A 6 is a divalent group selected from the following groups: Y 4 -(CH 2 ) a -CONR 10 -CH 2 -CHR 9 - (R 9 , R 10 , a and Y 4 are the same as defined above); CH 2 -NR 10 CO-(CH 2 ) d - (R 10 and d are the same as defined above) a group of the formula: wherein a and c are the same as defined above. (b) X is a group of the formula (3): wherein Y 2 , Y 3 , V 3 , V 4 , V 5 , V 6 and V 7 are the same as defined above, or a group of the formula (4): wherein Y 2 , Y 3 , V 3 and m are the same as defined above, A 6 is a divalent group selected from the following groups: (CH 2 ) f -CONR 10 -CH 2 -CHR 9 - (R 9 , R 10 and f are the same as defined above); Y 4' -(CH 2 ) d - (Y 4' and d are the same as defined above); (CH 2 ) f -CO-(CH 2 ) d - (f and d are the same as defined above); a group of the formula: wherein a and f are the same as defined above; a group of the formula: wherein f and Y 6 are the same as defined above. The compound according to any one of claims 1 or 2, wherein X is a group of the formula (6): wherein Y 2 , Y 3 , V 3 , V 4 , V 6 and V 7 are the same as defined above, or a pharmaceutically acceptable salt thereof. The compound according to claim 3, wherein Y 2 and Y 3 are a methine group, and V 6 and V 7 are a hydrogen atom, or a pharmaceutically acceptable salt thereof. The compound according to claim 1, wherein X is a 4-amidinophenyl group, and A 6 is -CO-NH-CH 2 -CH 2 - or -O-(CH 2 ) 3 -, or a pharmaceutically acceptable salt thereof. The compound according to any one of claims 1 to 5, wherein the stereoconfiguration of the 2-position thereof is S-configuration, or a pharmaceutically acceptable salt thereof. A pharmaceutical composition containing a compound as set forth in any one of claims 1 to 6. Use of a compound as set forth in any one of claims 1 to 6 for the preparation of a pharmaceutical composition for use as a platelet aggregation inhibitor, a cancer metastasis inhibitor, a wound healing agent or a bone resorption inhibitor.

Inventors: IKEDA YOSHIHARU, KAMIKAWA YUMIKO, KISHIMOTO HISAKAZU, NISHIHARA TOSHIO, UEKI YASUYUKI, IKEDA, YOSHIHARU, KAMIKAWA, YUMIKO, KISHIMOTO, HISAKAZU, NISHIHARA, TOSHIO, UEKI, YASUYUKI, NISHIHARA, Toshio Studio In Dekijimaeki 247
Applicants: SUMITOMO PHARMA, SUMITOMO PHARMACEUTICALS COMPANY, LIMITED
Application year: 1994
Main classification: C07C311
IPC codes: C07D211, C07D213, C07D217, C07C311, C07D295